DTPMP


Diethylenetriamine pentamethylene phosphonic acid
DTPMP or diethylenetriamine penta(methylene phosphonic acid) is a phosphonic acid. It has chelating and anti corrosion properties.


Properties
DTPMP is normally delivered as salts, because the acid form has very limited solubility in water and tends to crystallize in concentrated aqueous solutions. 
DTPMP is a nitrogenous organic polyphosphonic acid. DTPMP shows very good inhibition of the precipitation of barium sulfate (BaSO4). 
At high alkali and high temperature (above 210 °C) environments DTPMPA has better scale and corrosion inhibition effect than other phosphonates.

Diethylene Triamine Penta (Methylene Phosphonic Acid) is innocuous, easy to be dissolved in acid solution. 
Diethylene Triamine Penta (Methylene Phosphonic Acid) has excellent scale and corrosion inhibition and good thermal tolerance ability. 
Diethylene Triamine Penta (Methylene Phosphonic Acid) can inhibit the scale formation of carbonate, sulfate and phosphate. 
On situation of alkali environment and high temperature (above 210℃) DTPMPA has better scale and corrosion inhibition effect than other organophosphines.


IUPAC name: [[(Phosphonomethyl)imino]]bis[[2,1-ethanediylnitrilobis(methylene)]]tetrakis-phosphonic acid
Other names: DTPMPA, Diethylenetriaminepenta(methylene-phosphonic acid)


Diethylene Triamine Penta (Methylene Phosphonic Acid) can also be used as peroxide stabilizer, chelating agent in woven & dyeing industry, pigment dispersant, microelement’s carrying agent in fertilizer and concrete modifier. 
In addition, DTPMPA is used in papermaking, electroplating, acid cleaning and cosmetics.

SYNONYMS    
DTPMP, DETPMP, Phosphanate, (Phosphonomethyl)Imino Bis Ethane-2,1-Diylnitrilobis(Methylene) Tetrakisphosphonic Acid

CAS Number: 15827-60-8 

EC / List no.: 239-931-4
CAS no.: 15827-60-8
Mol. formula: C9H28N3O15P5

[[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid


Diethylenetriaminepentakis(methylphosphonic acid) (DTPMP) is a multidentate chelating agent. 
Hydrogen peroxide oxidation of DTPMP is reported.
DTPMP, a phosphonate, is commonly used as crystallization inhibitors.

Application
Diethylenetriaminepentakis(methylphosphonic acid) solution is suitable for use in a study to investigate the dynamics and kinetics of sodium sulfate crystallization in the presence of various organophosphonic acids.
It may be employed as ligand for the characterization of Ce3+ complexes by luminescence spectroscopy.


DTPMP can be used as scale and corrosion inhibitor in circulating cool water system and boiler water, especially in alkali circulating cool water without additional pH regulation. 
It can also be used in oilfield refill water, cool water and boiler water with high concentration of barium carbonate.

It can also be used in oilfield refill water, cool water and boiler water with high concentration of barium carbonate. 
When used alone, little scale sediment is found even without using dispersant.

DTPMP can also be used as peroxide stabilizer (especially under the condition of high temperature, the stability of hydrogen peroxide is very good), as chelating agent in woven & dyeing industry, as pigment dispersant, as oxygen delignification stabilizer, as microelement’s carrying agent in fertilizer, and as concrete additive.

In addition, DTPMP is also used in papermaking, electroplating, metal pickling and cosmetics. 
It can also be used as stabilizer for oxidizing bactericide.

Diethylenetriaminepenta (methylenephosphonic acid) sodium salt (DTPMPA Na)
Diethylenetriamine penta(methylene phosphonic acid) sodium salt (DTPMPA Na) is a cost effective scale inhibitor used in various industrial applications such as industrial water treatment and detergents. 
It further shows good stability in presence of chlorine as well corrosion inhibition properties in presence of zinc and other phosphates. 

DTPMPA Na can be also used as chelating agent in the textile industry.

APPLICATIONS
Electroplating
Leather Tanning and Processing
Mining
Painting (Pigments, Binders, and Biocides)
Petroleum Production and Refining
Photographic Processing
Pulp and Paper Processing
Sewer and Wastewater Treatment
Textiles (Printing, Dyeing, or Finishing)

Synonyms
Diethylenetriamine, pentamethylenepentaphosphonic acid; (((Phosphonomethyl)imino)bis(ethane-2,1-diylnitrilobis(methylene)))tetrakisphosphonic acid; Phosphonic acid, (((phosphonomethyl)imino)bis(2,1-ethanediylnitrilobis(methylene)))tetrakis-; Phosphonic acid, P,P',P'',P'''-(((phosphonomethyl)imino)bis(2,1-ethanediylnitrilobis(methylene)))tetrakis-; [ChemIDplus] Acide diethylènetriaminepenta(methylenephosphonique); CP 66257; Dequest 2060; Diethylenetriamine penta(methylenephosphonic acid); Diethylenetriaminopenta(methylenephosphonic acid); DTPMP; DTPMPA; MK-108; [IUCLID] [(Bis{2-[bis(phosphonomethyl)amino]ethyl}amino)methyl]phosphonic acid; DETPMP; Diethylene Triamine Penta (Methylene Phosphonic Acid); DIETHYLENE TRIAMINE PENTA; [ECHA REACH Registrations]

Sources/Uses
DTPMP is used in the chemical, leather processing, paper-pulp-board, paints-lacquers-varnishes, textile processing, and detergents industries; 
DTPMP is used in water treatment, as a scale inhibitor, cleaning/washing agent, dispersing agent, complexing agent, and bleach stabilizer; 
DTPMP is used to formulate polishes and wax blends, washing-cleaning products, water softeners, water treatment chemicals, air care products, biocidal products, coatings-paints, fillers-putties-plasters, fertilizers, inks-toners, processing aids (i.e. pH regulators, flocculants, and precipitants), laboratory chemicals, leather tanning-dying-finishing products, paper and board dying-impregnation-finishing products, textile dying-impregnation-finishing products, cosmetics-personal care products, perfumes-fragrances, photo-chemicals, extraction agents, metal surface treatment products (including those for galvanizing and electroplating), to make base metals and alloys, fabricated metal products, furniture, ceramics, large scale chemicals, in mining, oilfield water systems, electricity-steam-gas-water supply, sewage treatment, building and construction work, agriculture-forestry-fishing; [ECHA REACH Registrations] Permitted for use as an inert ingredient in non-food pesticide products; [EPA]

Applications:

Cooling water systems / industrial water treatment
Industrial detergents
Swimming pools
Metal surface treatment as corrosion inhibitor for steel
Sequestering agent in textile auxiliaries
Peroxide bleach stabilizer

DTPMP derived from phosphorous (phosphonic) acid are employed in the applications of scale Inhibition, sequestration, dispersion and corrosion inhibition in addition to the main applications of agricultural chemicals such as fertilizers, pesticides, and soil conditioners. 
DTPMP offer a wide range of sequestrants to control metal ions in aqueous systems. 
By forming stable water soluble complexes with multivalent metal ions, DTPMP prevents undesired interaction by blocking normal reactivity of metal ions. 
This ability contributes to function as threshold industrial water treatment and metal treatment processes (antiscalants, corrosion inhibitors, chelants, sludge conditioners, pulp bleachings, deflocculants, dispersants, metal cleaners, electroplating and crystal growth modifiers). 
DTPMP is used in manufacturing detergents, cosmetics and personal care products for special functions such as low levels iron control, stain removal, bleach stabilization, peroxide stabilization and anti-encrustation. 
DTPMP existing in various compounds as acids or salts are marketed in the form of concentrated solutions.

Synonyms:

DTPMPA; DTPMP; DETPMP; DETPMP(A);

Diethylene Triamine Penta (Methylene Phosphonic Acid);

Diethylene triamine penta;

Diethylenetriaminepenta -Methylenephosphonic Acid (DETPMP);


The CUBLEN D Series (DTPMP) represents the most versatile phosphonic acid in the CUBLEN product range and impresses with its outstanding price-performance ratio. 
DTPMP is an excellent inhibitor for mineral deposits (for example CaCO3, BaSO4, SrSO4) and a powerful complexing agent. 
Selected DTPMP products are certified according to the North American standard NSF/ANSI 60 for use in the production of drinking water.

Diethylenetriaminepentatakis(methylene phosphonic acid) (DTPMP) is commonly used in oilfield for scale inhibition

Phosphonates Antiscalants, Corrosion Inhibitors and Chelating Agents 

DTPMP Acid, DETPMP
Properties:
DTPMP (DETPMP) acid is innocuous, easy to be dissolved in an acid solution. It has an excellent scale and corrosion inhibition and good thermal tolerance ability.

DTPMP (DETPMP) can inhibit the scale formation of carbonate, sulfate, and phosphate. On the situation of the alkali environment and high temperature (above 210℃), DETPMP has a better scale and corrosion inhibition effect than other organophosphines.

CAS No.: 15827-60-8

Molecular Formula: C9H28O15N3P5

Molecular Weight: 573.2

Applications
Detergents and cleaning agents
Water treatment
Scaling inhibitor
Chelating agent
Deflocculation agent / settling retarder
Anti corrosion agent

DTPMP is non-toxic, easily soluble in acid solution. 
DTPMP has excellent scale and corrosion inhibition and good temperature tolerance ability. 
DTPMP can inhibit the scale formation of carbonate and sulfate. 
In alkaline environment and high temperature (above 210℃), its scale inhibition performance is better than other organic phosphine.

DTPMPA
Diethylene Triamine Penta (Methylene Phosphonic Acid)

INDUSTRIES
DTPMP has a broad performance and is used as corrosion and scale inhibitor (carbonates, sulfates and phosphates), chelating agent and stabilizing agent (e. g. for peroxides) in the detergents industry, water treatment and textile & dyeing industry.

MORE PHOSPHONATES
PHOSPHONATES
DTPMPA
PBTC
ATMP
EDTMPA
HEDP

[[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid

[[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid

[[][[](phosphonomethyl)imino]bis[[]ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid

CAS names
Phosphonic acid, P,P',P'',P'''-[[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-


IUPAC names
({[2-({2-[bis(phosphonomethyl)amino]ethyl}(phosphonomethyl)amino)ethyl](phosphonomethyl)amino}methyl)phosphonic acid
[(bis{2-[bis(phosphonomethyl)amino]ethyl}amino)methyl]phosphonic acid
[[(PHOSPHONOMETHYL)IMINO]BIS[ETHANE-2,1-DIYLNITRILOBIS(METHYLENE)]] TETRAKISPHOSPHONIC ACID
[[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid
[[(phosphonomethyl)imino}bis{ethane-2,1-diylnitrilobis(methylene)}}tetrakisphosphonic acid
[bis[2-[bis(phosphonomethyl)amino]ethyl]amino]methylphosphonic acid
DTPMP
DTPMPA
Methylene Phosphonic Acid
methylene phosphonic acid
Phosphonic acid (penta derivative)
Phosphonic acid, [[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-
{[bis({2-[bis(phosphonomethyl)amino]ethyl})amino]methyl}phosphonic acid


Trade names
Cublen DNC 450
DETPMP
DIETHYLENE TRIAMINE PENTA
Diethylene Triamine Penta (Methylene Phosphonic Acid)
DTPMP
DTPMPA

15827-60-8

diethylenetriamine pentamethylene phosphonic acid

Diethylenetriaminepenta(methylene-phosphonic acid)

UNII-0Q75589TM3

[bis[2-[bis(phosphonomethyl)amino]ethyl]amino]methylphosphonic acid

Diethylenetriaminepenta(methylenephosphonic) acid

Phosphonic acid, [[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-

0Q75589TM3

Diethylenetriaminepentakis(methylphosphonic acid) solution

DTPMP

C9H28N3O15P5

Phosphonic acid, (((phosphonomethyl)imino)bis(2,1-ethanediylnitrilobis(methylene)))tetrakis-

Phosphonic acid, P,P',P'',P'''-(((phosphonomethyl)imino)bis(2,1-ethanediylnitrilobis(methylene)))tetrakis-

Phosphonic acid, P,P',P'',P'''-[[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-

EINECS 239-931-4

DETPMP

EC 239-931-4

SCHEMBL22924

Diethylenetriamine, pentamethylenepentaphosphonic acid

DTXSID0027775

MFCD00129718

ZINC59129438

AKOS025310980

(((Phosphonomethyl)imino)bis(ethane-2,1-diylnitrilobis(methylene)))tetrakisphosphonic acid

P074

SC-47238

FT-0624891

diethylenetriamine pentamethylenephosphonic acid

827D608

A809915

diethylene triamine penta(methylene phosphonic acid)

J-009490

Q3011490

Diethylenetriaminepenta(methylenephosphonic acid) solution

[(bis{2-[bis(phosphonomethyl)amino]ethyl}amino)methyl]phosphonic acid

Diethylenetriaminepentakis(methylphosphonic acid) solution 50% in 15% HCl: 35% H2O

Diethylenetriaminepentakis(methylphosphonic acid) solution, technical, ~50% (T)

244775-22-2

DTPMP is a polyphosphonic acid of molecular weight 573. 
The phosphonic acid function is a strong acid, and it is frequently produced as a salt for reasons of ease of use. 
It can form stable complexes with polyvalent metal ions. 
As a consequence of the ionisation over typical pH ranges, it is of high water solubility (≥ 500 g/l) and low octanol-water partition coefficient (Log Kow = -3.4). Its vapour pressure is very low (1.67 x 10-10 Pa (estimated)). At pH 7, DTPMP in water will be almost fully ionised five times, with a majority of the molecules ionised six times, and some seven or eight times.

DTPMP is used as Scaling inhibitor, as Chelating agent, as Deflocculation agent or as settling retarder and as Anti corrosion agent. 
DTPMP is a Scale Inhibitor, for barium Sulphate in particular and a chelating agent. 
DTPMP can be used as stabilizer of peroxide bleaching, detergent auxiliaries, in industrial& munciple cleaning water, oil field water etc.

Diethylenetriaminepentatakis(methylene phosphonic acid) (DTPMP) is used in hydraulic fracturing of oilfield for scale inhibition.


Despite poor biodegradability, phosphonates are increasingly used as complexing agents in detergents, care and cleaning agents (DCC), and as industrial chemicals. 
The phosphonates most frequently contained in these products are 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC), 1-hydroxyethylidene(1,1-diphosphonic acid) (HEDP), aminotris(methylphosphonic acid) (ATMP), ethylenediaminetetra(methylene phosphonic acid) (EDTMP), and diethylenetriaminepenta-(methylene phosphonic acid) (DTPMP)


DTPMPA
Diethylene Triamine Penta (Methylene Phosphonic Acid)

INDUSTRIES
DTPMP has a broad performance and is used as corrosion and scale inhibitor (carbonates, sulfates and phosphates), chelating agent and stabilizing agent (e. g. for peroxides) in the detergents industry, water treatment and textile & dyeing industry.

MORE PHOSPHONATES
PHOSPHONATES
ATMP
HEDP
EDTMPA
DTPMPA
PBTC


Sodium salt of Diethylene Triamine Penta (Methylene Phosphonic Acid) (DTPMP•Na2)
CAS No.  22042-96-2
Molecular formula: C9H26O15N3P5Na2
Properties and usage:
DTPMP•Na2 is a scale inhibitor, for barium sulphate in particular and a chelating agent. DTPMP•Na2 can be used as stabilizer for peroxide bleaching, detergent auxiliaries, in industrial & municipal cleaning water, terrestrial heat water, oilfield water, etc.


Category Name
DTPMP and salts (Phosphonic Acid Compounds Group 3)
Diethylene triamine penta(methylene phosphonic acid) and its sodium salts

Chemical name CAS no. Abbreviation
Diethylene triamine penta(methylene phosphonic acid) CAS NO: 15827-60-8 DTPMP
Diethylene triamine penta(methylene phosphonic acid), xNa Salt CAS NO: 22042-96-2 DTPMP-xNa
Diethylene triamine penta(methylene phosphonic acid), Na Salt CAS NO: 94987-76-5 DTPMP-Na
Diethylene triamine penta(methylene phosphonic acid), 2Na Salt CAS NO: 94987-75-4 DTPMP-2Na
Diethylene triamine penta(methylene phosphonic acid), 3Na Salt CAS NO:95015-06-8 DTPMP-3Na
Diethylene triamine penta(methylene phosphonic acid), 4Na Salt CAS NO:94987-77-6 DTPMP-4Na
Diethylene triamine penta(methylene phosphonic acid), 5Na Salt CAS NO:61792-09-4 DTPMP-5Na
Diethylene triamine penta(methylene phosphonic acid), 6Na Salt CAS NO:93841-74-8 DTPMP-6Na
Diethylene triamine penta(methylene phosphonic acid), 7Na Salt CAS NO:68155-78-2 DTPMP-7Na
Diethylene triamine penta(methylene phosphonic acid), 8Na Salt CAS NO: 95183-54-3 DTPMP-8Na
Diethylene triamine penta(methylene phosphonic acid), 9Na Salt CAS NO:93841-75-9 DTPMP-9Na
Diethylene triamine penta(methylene phosphonic acid), 10Na Salt CAS NO: 93841-76-0 DTPMP-10Na

Evaluation of Diethylene Triamine-pentamethylene Phosphonic Acid (DTPMP) as Scale Inhibitor of Calcium Carbonate Scales in Oil Field Water
Research Paper Open Access w w w . a j e r . o r g 
Evaluation of Diethylene Triamine-pentamethylene Phosphonic Acid (DTPMP) as Scale Inhibitor of Calcium Carbonate Scales in Oil Field Water Abubaker K. Elayatt1 Hamad K. Altarhoni2 and Mahjoub A. M. Elaoud3


Scale formation is one of the most serious oil field problems that inflict water injection systems. 
This study was conducted to investigate the permeability reduction caused by deposition of scale in oil field water where contained high concentration of calcium ion at various temperatures (40, 60, 80 and 95 °C). 
The aim of this work is study the prevention or minimizing of scale formation in oil field by using economic and good performance inhibitor. 
The scale inhibitor phosphonate type (DTPMP) was conducted at low and high temperatures, was shows a good performance at low concentrations 3 to 20 ppm. 
Static test was carried out to demonstrate the best concentrations of scale inhibitors at different temperatures. 
The Dynamic test has also done for the sample by using dynamic scale rig test at a temperature of 75°C and injection rate of 2 liter per hour for sample (scaling solution) to determine the efficiency of scale inhibitor Diethylene triaminepentamethylene phosphonic acid (DTPMP) at injection rates of (3, 5, 7, 10, and 20ppm). 
From the both static and dynamic experiments we conclude that the performance of scale inhibitor (DTPMP) is effective in preventing calcium carbonate CaCO3 scale, where it has achieved efficiency at 40, 60, 80 and 95oC was 100, 98.20, 94.83 and 88.50% respectively, at concentration 10ppm. 
The performance of scale inhibitor considered an effective inhibitor where the minimum performance was 60.00 – 96.23% at low concentration (3 ppm); this is considered acceptable performance and economic as scale inhibitor in the oil fields water. 
Keywords: Diethylene triamine-pentamethylene phosphonic acid (DTPMP), Scale inhibitor, static test, dynamic test, jar test, scale rig.

IV. Conclusion and Recommendation 

Throughout the results illustrated in the laboratory of both static jar and dynamic test, which have been done for sample of well (Q-25) Waha oil field, and to identify the efficiency of the scale inhibitor (DTPMP) in eliminating the scale of calcium carbonate CaCO3 we found the following :Sample of well Q-25 has been done to determine the efficiency of scale inhibitor (DTPMP), at different temperatures (40, 60, 80 and 95°C) and scale inhibitor injection rates (3, 5, 7, 10, and 20 ppm). 
The experiments shows that the scale inhibitor (DTPMP) is effective in preventing formation of calcium carbonate CaCO3 scale, where it has achieved efficiency from 94.83% to 98.20% at concentration of scale inhibitor of 10ppm. 
The Dynamic test has cared out at 75°C and 2 liter per hour injection rate of scaling solution (well Q-25) to determine the efficiency of scale inhibitor (DTPMP) at concentration (3, 5, 7, 10 and 20 ppm) as shown in figures (7 (a) and 7 (b)). 
It has been noticed that the rate of change in pressure with respect to the time is constant, and this proves that the scale inhibitor (DTPMP) achieved a very good efficiency as it managed to prevent formation of calcium carbonate CaCO3 scale through a time period with respect to the injection of both the scale inhibitor and sample (scaling solution). 
The scale inhibitor (DTPMP) achieved a very good efficiency at injection rates of 10ppm. 
We conclude that the scale inhibitor (DTPMP) is very efficient in preventing calcium carbonate scale. 
It is advisable to inject at concentration rate of 10 ppm to provide economic wais and better performance.

High Return Performance of Calcium Phosphonate (Ca-DTPMP) Colloidal Inhibitors for Squeeze Treatment in Shale Formations
Shujun Gao*, Chong Dai, Xin Wang, Yue Zhao, Yi-Tsung Lu, Guannan Deng, Saebom Ko, Samiridhdi Paudyal, Khadouja Harouaka, Amy T. Kan and Mason Tomson
Department of Civil and Environmental Engineering, Rice University, Houston, TX, United States

The objective of this work was to develop nanomaterial inhibitor with long squeeze life for oil and gas production. Different surfactants, such as trisodium citrate (Na3Cit), cetyltrimethyl ammonium bromide, benzethonium chloride (Hyamine), and bipyridinium dibromide (Gemini), were added to synthesize nanoparticle Ca-DTPMP inhibitor at pH 9.0. The inhibitors were characterized by scanning electron microscope and dynamic light scattering. All these surfactants significantly decreased the particle size, but Gemini was the most effective one to control the calcium phosphonate salt particle size to be about 500 nm. Long-term squeeze experiments (∼3000 PV) saturated with calcite at 70°C and 75 psi back pressure through a glass column packed with Fayetteville shale rock show that the return DTPMP concentration was as high as 3 ppm for the Gemini–Ca-DTPMP colloidal inhibitor. This is an unprecedented improvement in comparison with the squeeze return of DTPMP only inhibitor where the inhibitor return concentration dropped to below 1 ppm within 400 pore volumes. The Ca-DTPMP speciation, potential field application, and the SqueezeSoftPitzer model prediction are also discussed.

Introduction
Scale formation has been a continuous challenge associated with the oil and gas industry. Scale formation can cause severe blockage problems in downhole equipment, wellbore, production tubulars, pump, separator, and so on, resulting in production decline, formation damage, increased cost, and even well shut-in (Guo et al., 2012; Sutherland et al., 2013; Veisi et al., 2018).

Squeeze treatment is one of the most effective and long-lasting approaches for scale inhibition and has been widely applied in the oilfield (Fleming et al., 2010; Zhang et al., 2011). In a squeeze treatment, scale inhibitor is injected (pill injection) into the well and retained on the formation rock by precipitation and/or adsorption during the well shut-in period. Once the well starts production, the inhibitor will gradually desorb, release, and flow back with the production water. If the inhibitor return concentration is higher than the required minimum inhibitor concentration (MIC), the scale formation will be inhibited (Vazquez et al., 2012). Therefore, one significant objective in squeeze research is to extend the squeeze lifetime, i.e., to maintain the return concentration above MIC as long as possible. Several methods have been attempted including (1) enhancers addition in preflush (Ghosh and Li, 2013; Sutherland and Jordan, 2016) or pill injection (Jordan et al., 2001; Selle et al., 2003), such as divalent metal ion Fe2+ and polyaspartic acid; (2) newly developed inhibitors such as γ-AlO(OH) nanoparticle in which the squeeze life time improved 60 times (Poynton et al., 2004; Vazquez et al., 2006; Yan C. et al., 2014); and (3) optimization of modeling design (Mackay and Jordan, 2003; Kan et al., 2005) such as SQUEEZE V and SqueezeSoftPitzer.

Previous results have shown that Ca2+ ion and DTPMP (diethylenetriamine pentamethylene phosphonic acid) can precipitate (denoted as Ca-DTPMP) and form a slurry solution. This Ca-DTPMP slurry inhibitor has a much longer squeeze life than the normal liquid DTPMP inhibitor (Ruan et al., 2016). The later DTPMP return concentration is below 1 ppm after 400 pore volumes (PV) flow back tested in Ottawa sand, while that is still above 1 ppm after 1500 PV using Ca-DTPMP inhibitor (Ruan et al., 2016). This was attributed to the large surface area to volume ratio and adsorption rate of the Ca-DTPMP nanomaterial inhibitor; the release kinetics was therefore favored. The particles were well developed, in other words, aged by successive dissolution to remove the high solubility phosphonate materials before use in the squeeze. It could gradually release inhibitor (long-term flowback). However, under certain conditions, 1 ppm is still not high enough especially at higher temperature conditions and brine higher saturation index values (SI) (Zhang et al., 2014). To better control the solubility and dissolution thermodynamics of the Ca-DTPMP inhibitor, one of the simplest and cost-effective approaches is to add different surfactants. Surfactants can greatly reduce surface tension and inhibit aggregation by providing electrostatic double-layer repulsions. Surfactants can also self-assemble to micelles and supply a soft template for formation of different nanostructures (Zargartalebi et al., 2015; Kamal, 2016).

Shale reservoirs have grown rapidly in recent years (Horner et al., 2016; Kilian, 2016). 
Fracking is frequently required in shale oil production. Unlike conventional carbonate formations, shale consists of not only carbonate but also large amount of quartz, clay, and some minor minerals. However, limited squeeze research has been conducted in shale formation (Yan et al., 2015). Whether the colloidal Ca-DTPMP inhibitor can be applied in shale oil well and the return behavior remain unknown.

Conclusion
High return performance was successfully achieved using Ca-DTPMP colloidal inhibitors prepared with different surfactants. The main conclusions that can be drawn are as follows:

• All the surfactants (Na3Cit, CTAB, Hyamine, and Gemini) decreased the particle size, but Gemini was the most effective surfactant to control the Ca-DTPMP particle size to be about ∼500 nm.

• The squeeze life was significantly increased using Ca-DTPMP nano-inhibitors. The smallest Ca-DTPMP inhibitor prepared with Gemini also shows the highest return concentration. The returned DTPMP concentration was as high as 3 ppm up to 3000 PV tested in Fayetteville shale core. The high return performance is consistent with the adsorption and solubility of the intermediate Ca-DTPMP phase.

• Laser turbidity experiments demonstrated that the returned DTPMP is still efficient and active for preventing barite nucleation. The projected squeeze life might be as long as 5 years at 3 ppm. Therefore, the nano-Ca-DTPMP inhibitor shows promise for practical use in oil and gas production.

Synonyms Diethylenetriamine-N,N,N′,N″,N″-pentakis(methylenephosphonic acid) Diethylenetriamine pentakis(methylene phosphonic acid)
Diethylenetriamine penta(methylene
phosphonic acid)
Ethylenetriamine penta(methylene phosphonic acid)
Chemical name [[(Phosphonomethyl)imino]bis[2.1-
ethane diylnitrilobis(methylene)]]tetrakisphosphonic acid
CAS number
Diethylenetriamine pentakis
(methylenephosphonic acid)
15827-60-8


Use emulsifier, dispersing agent, complexing agent, anticorrosive and hardness regulator in household and industrial cleaners, metal-working fluid, water-based processes and in water treatment, stabilizer for peroxides, and as an additive in oil production


Phosphonates are surface active compounds which are used in a wide variety of industrial applications, including scale and corrosion control, metal finishing, industrial cleaning, dispersants and chelants [1]. 
One of the most popular applications of phosphonates is to inhibit the formation of scale via a threshold effect, in which a few milligrams per liter of phosphonates or less, is added to the intake water of cooling towers, electric utilities, or oil and gas wells to prevent scale formation. 
Many oil and gas fields produce 10 to 20 barrels of brine for every barrel of oil (or gas equivalent). 
These produced brines are generally corrosive and tend to produce calcite or sulfate scales and phosphonates are the most commonly used chemicals to prevent scale formation. 
In the United States the annual sales of phosphonates exceeds 2 billion dollars per year. 
In many instances phosphonates encounter high concentrations of divalent metal ions and precipitate as metal salts. 
In the oilfield application phosphonates are squeezed into the subsurface where they precipitate with divalent cations such as calcium, zinc, magnesium and iron, and then slowly release into the produced fluids during production to inhibit the formation of mineral scale - this is called a "squeeze treatment". 
Considering the importance of phosphonate precipitates in industrial applications research has been done related to cation-phosphonate precipitation chemistry.
A main shortage of the conventional squeeze treatments is that most of the acidic phoshonate is precipitated near the entrance of the formation because the reaction of acid with carbonate and the formation of Ca- phoshonate precipitation take place very quickly. 
As a result, only limited reservoir protection distance can be provided near the wellbore. 
Adsorption squeezes are often performed in reservoirs where a neutralized inhibitor pill solution is injected into formation. 
However, compared with precipitation squeeze, little or negligible amount of inhibitor can be retained and released slowly from the formation. 
A large fraction of the phosphonate tends to flow back within a few days and then decreases to an extremely low value which is not enough to effectively inhibit scale formation.


Hepta sodium salt of Diethylene Triamine Penta (Methylene Phosphonic Acid) (DTPMP•Na7)
CAS No.  22042-96-2 (x-Na) 68155-78-2 (7-Na)

Molecular Formula: C9H21O15N3P5Na7                
Molecular weight: 727
DTPMP•Na7 is a scale inhibitor, for barium sulphate in particular and a chelating agent. 
DTPMP•Na7 can be used as stabilizer for peroxide bleaching, detergent auxiliaries, in industrial & municipal cleaning water, terrestrial heat water, oilfield water, etc.

•    dtpmp
•    DIETHYLENETRIAMINEPENTAKIS(METHYLPHOSPHONIC ACID)
•    DIETHYLENE TRIAMINE PENTA(METHYLENE PHOSPHONIC ACID)
•    DEQUEST(R) 2060
•    Diethylenetriamine,pentamethylenepentaphosphonicacid
•    diethylenetriaminepenta(methylenephosphonic)
•    Phosphonic acid, P,P',P'',P'''-[ [(phosphonomethyl)imino]bis[2,1-e thanediylnitrilobis(methylene)]]tetrakis -
•    dequest 2060
•    diethylenetriaminepentakis(methylphosphonic acid)solution
•    Diethylenetriamine Penta (Methylene Phosphonic Acid) (DTPMP)
•    DIETHYLENEPENTA(METHYLENEPHOSPHONICACID)
•    DIETHYLENETRIAMINEPENTAKIS-METHYLENEPHOSPHONICACID
•    [[(Phosphonomethyl)imino]bis[ethan-2,1-diylnitrilobis(methylen)]]tetrakisphosphonsure
•    N,N,N',N',N''-Pentakis(phosphonomethyl)diethylenetriamine
•    Diethylenetriaminepentamethylenphosphonic acid
•    [(Bis{2-[bis(phosphonomethyl)amino]ethyl}amino)methyl]phosphonic acid
•    Diethylenetriaminepentakis(methylphosphonic acid) solution,Dequest 2060
•    Diethylene TriaMine Penta(Methylene Phosphonic Aicd)
•    DTPMP)DiethylenetriaMinepentakis(Methylphosphonic acid) s
•    DiethylenetriaMinepentakis(Methylphosphonic acid) solution,50%
•    Diethylenetriaminepentakis(methylphosphonic acid) solution technical, ~50% (T)
•    DETPMP Dequest:2060
•    diethylenetriaminepenta(methylphosphonicacid)
•    diethylenetriaminepentakis(methylphos-phonicacid)sol.
•    e)]]tetrakis-
•    phosphonicacid,[[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylen
•    Phosphonicacid,[[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-
•    [[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid
•    stabilizer WPW-2 of hydrogen peroxide
•    DETPMP
•    DIETHYLENE TRIAMINE PENTA
•    [[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-phosphonic acid
•    DTPMPA (Diethylene Triamine Penta (Methylene Phosphonic Acid) )
•    DieJSylene Triamine Penta (MeJSylene Phosphonic Acid) (DTPMPA)
•    Diethylenetriaminepenta(methylenephosphonic acid), technical grade 50%
•    Diethylenetriamine pentamethronic acid
•    Diethylenetriaminepenta(methylene-phosphonic acid) fandachem
•    15827-60-8
•    C9H28N3O15P5
•    Building Blocks
•    Organic Building Blocks
•    Phosphorus Compounds
•    Phosphonic/Phosphinic Acids
•    Water treatment
•    Organics
•    Phosphonate antiscalant


In conjunction with their excellent hydrolytic and thermal stability, these properties make phosphonates superior to other sequestering agents in cost-effectiveness and performance.

High stability constants of phosphonates with heavy metals, ensures improved stabilization of the active bleach and assists in the removal of stains caused by heavy metal-containing liquids like tea, coffee, red wine, etc.

The phosphonates from ATAMAN CHEMICALS are utilised in a multitude of industries, such as in Home and Personal care, Industrial & Institutional scenarios, Industrial water treatment, Desalination plants, Oil & Gas, Pulp & Paper manufacturing, Geothermal industries, Mining and Textile industries – where water is essential in the processes. 


ATAMAN CHEMICALS Phosphonates product range
ATAMAN offers a wide range of phosphonate products. 

The portfolio focusses on various chemistries, such as:

• HEDP
• ATMP
• DETPMP
• PBTC
• AEEA Phosphonate
• BHMTMP
• PAPEMP
• HMDTMP
• HPAA
• EDTMP
• EABMP
• PMP

DTPMP covers wide range of industrial applications such as scale inhibition/prevention, dispersion, bleach stabilization, metal chelation, cleaning agents and metal corrosion inhibition. Aquapharm also manufactures special grades of phosphonates with high purity low chloride for cosmetics and other applications.

Specialty Phosphonates
ATAMAN offers wide range of speciality phosphonates in their solid forms such as powder and granules in addition to standard liquid offerings. 
The phosphonate business unit manufactures various speciality products and formulations meeting properties for a number of specific industrial applications.

Applications
DTPMP is used as speciality additives in different industrial applications such as dispersion, bleach stabilization, metal chelation, cleaning agents in homecare, and scale inhibition & metal corrosion inhibition in cooling water application.

Our phosphonates find usage in an extremely broad spectrum of technical fields. This is mainly due to their multifunctional properties:-
• Complexing agent and threshold active substance
• Efficient dispersant properties
• Excellent hydrolytic and thermal stability
• Ability to control scale formation
• Prevention of water hardness ions & other trace metal ions

(((Phosphonomethyl)imino)bis(ethane-2,1-diylnitrilobis(methylene)))tetrakisphosphonic acid
(1,2-Ethandiylnitrilodimethylen)pentakis(phosphonsäure) [German] [ACD/IUPAC Name]
[(Bis{2-[bis(phosphonomethyl)amino]ethyl}amino)methyl]phosphonic acid
[[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid
[1,2-Ethanediylnitrilobis(methylene)]pentakis(phosphonic acid) [ACD/IUPAC Name]
0Q75589TM3
15827-60-8 [RN]
2068968
239-931-4 [EINECS]
Acide (1,2-éthanediylnitrilodiméthylène)pentakis(phosphonique) [French] [ACD/IUPAC Name]
Dequest® 2060
DIETHYLENETRIAMINE PENTAMETHYLENE PHOSPHONIC ACID
Diethylenetriamine, pentamethylenepentaphosphonic acid
Diethylenetriaminepenta(methylenephosphonic) acid
DTPMPA
MFCD00129718 [MDL number]
phosphonic acid, (((phosphonomethyl)imino)bis(2,1-ethanediylnitrilobis(methylene)))tetrakis-
Phosphonic acid, [[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-
Phosphonic acid, [1,2-ethanediylnitrilobis(methylene)]pentakis- [ACD/Index Name]
UNII-0Q75589TM3
((BIS(2-(BIS(PHOSPHONOMETHYL)AMINO)ETHYL)AMINO)METHYL)PHOSPHONIC ACID
({[2-({2-[BIS(PHOSPHONOMETHYL)AMINO]ETHYL}(PHOSPHONOMETHYL)AMINO)ETHYL](PHOSPHONOMETHYL)AMINO}METHYL)PHOSPHONIC ACID
[BIS({2-[BIS(PHOSPHONOMETHYL)AMINO]ETHYL})AMINO]METHYLPHOSPHONIC ACID
[bis[2-(bis(phosphonomethyl)amino)ethyl]amino]methylphosphonic acid
[bis[2-[bis(phosphonomethyl)amino]ethyl]amino]methylphosphonic acid
2060
244775-22-2 [RN]
291513-72-9 [RN]
50%, Technical Grade
Dequest®
DETPMP
Diethylene Triamine Penta(methylene Phosphonic Acid)
Diethylenetriaminepenta(methylene-phosphonic acid)
diethylenetriaminepentakis(methylphos-phonic acid) sol.
Diethylenetriaminepentakis(methylphosphonic acid) solution 50% in 15% HCl: 35% H2O
Diethylenetriaminepentakis(methylphosphonic acid) solution, tech.
DTPMP
P,?P',?P'',?P'''-?[[(phosphonomethyl)?imino]?bis[2,?1-?ethanediylnitrilobis?(methylene)?]?]?tetrakis-Phosphonic acid
UNII:0Q75589TM3

DTPMPA•Na5 is innocuous, easy to be dissolved in acid solution,and has a perfect chelation ability. 
DTPMPA•Na5 can also be used as peroxide stabilizer(especially for hydrogen peroxide in the condition of high temperature),chelator in paper making and printing and dyeing, dispersing agent in pigment, stabilizer in oxygen delignification, microelement carryingt agent in fertilizer, additive in concrete. 
Moreover, DTPMPA•Na5 also has a widely use in paper making, electroplate, metal acid clearning, cosmetic and stabilizer in oxidizing biocide.

Usage:
DTPMP•Na5 can be used as peroxide stabilizer, chelating agent in woven & dyeing industry, pigment dispersant, microelement’s carrying agent in fertilizer and concrete modifier. 
DTPMP.Na5 is used in papermaking, electroplating, acid cleaning and cosmetics.


Phosphonates are organic compounds and salts of the phosphorous acid. The products are used in cooling water systems, desalination facilities, in the paper and textile industry as well as in detergents and household products. 
Phosphonates are used as sequestrants / chelating agents. 
Our phosphonates have a good temperature and hydrolyse-stability and can be used in acidic and alkaline conditions.

DTPMP•Na5 is a neutral product. 
DTPMP•Na5 is notoxic, easily dissolved in water. 
It functions as a scale and corrosion inhibitorin circulating cool water system and boiler water system.
DTPMP•Na5 Also can be used as peroxide stabilizer, chelator in textile and dying field, dispersant for paint, microelement carrier in fertilizer, beton additives. 
Also it is widely used in paper making, electroplate and cosmetic field.
The solid state DTPMP•Na5 is slightly easy to deliquescence, convenient in transportation and suitable for usage in winter and freezing districts.


SYNONYMS: DTPMP heptasaodium salt
CAS No: 68155-78-2 (7-Na)
MOLECULAR FORMULA: C9H21O15N3P5Na7
PROPERTIES:
DTPMP. Na7 is a scale inhibitor, for barium sulphate in particular and a chelating agent. 
DTPMP. Na7 can be used as stabilizer for peroxide bleaching, detergent auxiliaries, in industrial & municipal cleaning water, terrestrial heat water, oilfield water, etc.

It is mainly used as Chelating (Sequestrating) agent, Peroxide Bleach Stabilization.


Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques: Part II Field Evaluation of Inhibitor Effectiveness, TR-469, 2004
(2004) Reduction of Concrete Deterioration by Ettringite Using Crystal Growth Inhibition Techniques: Part II Field
Abstract
The effects of diethylenetriaminpenta(methylenephosphonic acid) (DTPMP), a phosphonate inhibitor, on the growth of delayed ettringite have been evaluated using concrete in highway US 20 near Williams, Iowa, and the cores of six highways subject to moderate (built in 1992) or minor (built in 1997) deterioration. 
Application of 0.01 and 0.1 vol. % DTPMP to cores was made on a weekly or monthly basis for one year under controlled laboratory-based freeze-thaw and wet-dry conditions over a temperature range of -15 degrees to 58 degrees C to mimic extremes in Iowa roadway conditions. 
The same concentrations of phosphonate were also applied to cores left outside (roof of Science I at Iowa State University) over the same period of time. Nineteen applications of 0.1 vol. % DTPMP with added deicing salt solution (about 23 weight % NACL) were made to US 20 during the winters of 2003 and 2004. 
In untreated samples, air voids, pores, and occasional cracks are lined with acicular ettringite crystals (up to 50 micrometers in length) whereas air voids, pores, and cracks in concrete from the westbound lane of US 20 are devoid of ettringite up to a depth of about 0.5 mm from the surface of the concrete. 
Ettringite is also absent in zones up to 6 mm from the surface of concrete slabs placed on the roof of Science I and cores subject to laboratory-based freeze-thaw experiments. 
In these zones, the relatively high concentration of DTPMP caused it to behave as a chelator. 
Stunted ettringite crystals 5 to 25 micrometers in length, occasionally coated with porlandite, form on the margins of these zones indicating that in these areas DTPMP behaved as an inhibitor due to a reduction in the concentration of phosphonate. 
Analyses of mixes of ettringite and DTPMP using electrospray mass spectrometry suggests that the stunting of ettringite growth is caused by the adsorption of a Ca2+ ion and a water molecule to deprotonated DTPMP on the surface of the {0001} face of ettringite. 
It is anticipated that by using a DTPMP concentration of between 0.001 and 0.01 vol. % for the extended life of a highway (i.e. >20 years), deterioration caused by the expansive growth of ettringite will be markedly reduced.


Substance Details
CAS Registry Number: 15827-60-8
CA Index Name: Phosphonic acid, [[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-

Synonyms:
[[(Phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakisphosphonic acid
[[(Phosphonomethyl)imino]bis[ethan-2,1-diylnitrilobis(methylen)]]tetrakisphosphonsaure
[[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid
Acide [[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonique
acido [[(fosfonometil)imino]bis[etano-2,1-diilnitrilobis(metilen)]]tetrakisfosfonico
Briquest 543-45AS
CIX
Cublen D 50
Dequest 2060
Dequest 2060A
Dequest 2060S
Dequest SPE 9505
DETPMP
DIETHYLENE TRIAMINE PENTA(METHYLENE PHOSPHORIC ACID)
DIETHYLENETRIAMINE PENTAMETHYLENE PHOSPHONIC ACID
Diethylenetriamine, pentamethylenepentaphosphonic acid
Diethylenetriamine-N,N,N',N'',N''-penta(methylenephosphonic acid)
Diethylenetriamine-N,N,N',N'',N''-pentakis(methylenephosphonic acid)
Diethylenetriaminepenta(methylenephosphonic acid)
Diethylenetriaminepentakis(methylenephosphonic acid)
Diethylenetriaminepentakis(methylphosphonic acid)
Diethylenetriaminopenta(methylenephosphonic acid)
DQ 2060
DTPA-P
DTPF
DTPMP
DTPP
DTPPA
Ethylenetriaminepenta(methylenephosphonic acid)
Lonza 905
Phosphonic acid, [[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-
Phosphonic acid, [[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-
PHOSPHONIC ACID, [[(PHOSPHONOMETHYL)IMINO]BIS[2,1-ETHANEDIYLNITRILOBIS(METHYLENE]]TETRAKIS-
Phosphonic acid, [[bis[2-[bis(phosphonomethyl)amino]ethyl]amino]methyl]
Phosphonic acid, [[bis[2-[bis(phosphonomethyl)amino]ethyl]amino]methyl]-
Phosphonic acid, P,P',P'',P'''-[[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-
Sequion 40H50
Versenate PS

Inhibition of Carbon Steel Corrosion by DTPMP – SPT –Zn2+System
B.Balanaga karthik1*, P.Selvakumar2, C.Thangavelu3

Abstract- With the objective of developing a new eco-friendly inhibitor formulation for the corrosion of carbon steel on neutral aqueous solution containing 60 ppm Cl- . 
The phosphonic acid {diethylenetriamine penta(methylene phosphonic acid)}(DTPMP) was chosen as the inhibitor, which gives the inhibition efficiency of 93%. 
Many phosphonic acids are used as good corrosion inhibitors like ATMP, HEDP and DTPMP etc. 
Among which we have used the DTPMP as a potent corrosion inhibitor for this study. 
Because it contains number hetero atoms like Oxygen and Nitrogen. 
The Sodium potassium Tartrate (SPT) which is an environment friendly and used as the first synergist, Zn2+ may be second synergist so it may used as a ternary inhibitor system. 
When DTPMP used alone shows some inhibition efficiency. 
If we combine with the formulation of 60 ppm Cl- , 50 ppm DTPMP, 25 ppm SPT, and 10 ppm Zn2+ , it gives maximum inhibition efficiency. From FTIR spectra it was observed that the protective film is formed on the metal surface. EIS spectra also confirms the formation of protective film on the metal. 

Index Terms- Electrochemical studies, Inhibitors, Phosphonic acid, protective film, SEM, Synergism

Mechanism of Corrosion Inhibition In order to explain the experimental results, the following mechanism was proposed for corrosion inhibition. 
The formulation consisting of 50 ppm of DTPMP, 25 ppm of SPT and 10 ppm of Zn2+ has 93 % Inhibition Efficiency. 
Polarization study reveals that the formulation functions as anodic inhibitor. 
Electrochemical Impedance spectra reveal that the protective film is formed on the metal surface. 
FT-IR spectra show that the protective film consists of Fe2+ - DTPMP complex. 
When formulation consisting of 60 ppm Cl- , 50 ppm DTPMP, 25 ppm SPT and 10 ppm Zn2+ is prepared, there will be the formation of DTPMP-Zn2+ and SPT- Fe2+ complexes in the solution .
When Carbon steel is immersed the complexes formed on the solution may diffuse to the metal. 
On the Carbon steel the Zn2+ complexes are converted into iron complexes29 on the anodic sites. 
Zn2+ - DTPMP + Fe2+ Fe2+ - DTPMP + Zn2+ Zn2+ - SPT + Fe  Fe2+ - SPT + Zn2+ 
The released Zn2+ ions reacts with OHions to form Zn (OH)2 Zn2+ + 2OH-  Zn (OH)2 ↓ Thus the protective film consists of Fe2+ - DTPMP, Fe2+ - SPT and Zn (OH)2 complexes. 
Thus Zn(OH)2 precipitate may take place at cathodic sites thus decreasing the rate of further oxygen reduction. 

IV. CONCLUSION 
A formulation consisting of DTPMP, SPT and Zn2+ can be used as a potent inhibitor to prevent the corrosion of Carbon steel in 60 ppm Cl- medium. 
DTPMP plays an excellent synergistic role in the SPT- Zn2+ - DTPMP system. The ternary system SPT (25ppm) – Zn2+ (10 ppm) – DTPMP (50ppm) is effective and it gives 93 % of Inhibition Efficiency. 
Significant synergism was obtained by the combined application of SPT- Zn2+ - DTPMP. 
The concentration of Zn2+ can be reduced by the addition of SPT. The DTPMP is an eco-friendly and is required very low concentrations. 
Thus this new inhibitor formulation is environment friendly. The inhibitor formulation acts as anodic inhibitor. 
In presence of the inhibitor, the charge transfer resistance is significantly increased. 
Also, the double layer capacitance of surface film reduced markedly. 
Both SPT and DTPMP form stable complexes with metal ions in the metal surface. 
The protective film consists of Fe2+ - SPT, Fe2+ - DTPMP and Zn (OH)2

Canada provisionally clears anti-scale compound DTPMP
21 March 2019
The Canadian government has provisionally concluded that DTPMP, which is used as a chelating agent, is not harmful to human health or the environment at current levels of exposure. 
The conclusion comes in a draft screening assessment of the...

Canada
Risk assessment
Environmental Protection Act
The Canadian government has provisionally concluded that DTPMP, which is used as a chelating agent, is not harmful to human health or the environment at current levels of exposure. 
The conclusion comes in a draft screening assessment of the substance, published on 16 March.

Chelating agents, which can be molecules or ions, form multiple, coordinating bonds with metals ions, rendering them inactive and unable to interact with other chemical species in the same solution.

According to the assessment, DTPMP is often used commercially in bleaching systems to prevent the formation of scale on surfaces. It is also used commercially in:

industrial water treatment;
laundry and dishwashing products;
paints and coatings;
oil and gas extraction;
construction materials;
paper products;
inks, toners and colourants;
photographic supplies, and
household and personal care products.

The substance is found in some products available to consumers, including permanent hair dye products and lubricating eyedrops, in which it is a non-medicinal ingredient.

The scientific literature provides evidence that DTPMP may have adverse effects on human health. 
The assessment took disruption of the body’s ability to maintain stable levels of iron and calcium as critical for risk assessment. 
It also took consumer use of permanent hair dye products and lubricating eye drops as exposure scenarios.

Combining the hazard and exposure data resulted in a prediction of low risk to human health.

Overall, the assessment concluded that the substance did not meet any of the criteria in section 64 of the Canadian Environmental Protection Act (Cepa).

The government has launched a 60-day public consultation, ending on 15 May.


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