Chemical Structure of DTPMP


Diethylene Triamine Penta (Methylene Phosphonic Acid)

CAS No.: 15827-60-8;
Molecular Formula: C9H28N3O15P5
Relative molecular mass 573.2

Diethylenetriamine, pentamethylenepentaphosphonic acid;
[[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid;
[(bis{2-[bis(phosphonomethyl)amino]ethyl}amino)methyl]phosphonic acid;

DTPMP is a polyphosphonates chelating agent (also known as sequestering agent, complexing agent).
It is especially suitable for alkaline circulating cooling water, as scale and corrosion inhibitor without pH adjustment.
DTPMP has better scale and corrosion inhibition performance than other organophosphines in alkaline and good temperature resistance (above 210℃).

We also provide DTPMP salts.
Phosphonic acid, [[(phosphonomethyl)imino]bis[2,1-ethanediylnitrilobis(methylene)]]tetrakis-, salts.
e.g. CAS# 68155-78-2 (DTPMP.7Na); 22042-96-2 (DTPMP.x-Na); 68400-03-3 (DTPMPA.5K); DTPMPA.xNH4; 67785-99-3, 70714-66-8, C9H28N3O15P5·xH3N;

1. Good scale and corrosion inhibition, inhibit the generation of carbonate and sulfate scale.
2. Stable and good performance in high pH and temperature (above 210℃).
3. For barium carbonate, barium sulfate BaSO4 and other oilfield refill water treatment and power plant ash flushing water system.

1. Anti-scaling agent and corrosion inhibitor for circulating cooling water and boiler water.
2. Peroxide bleaching stabilizer, especially under high temperature conditions.
It can also be used as stabilizer of chlorine dioxide fungicide.
3. Dispersing agent for pigment, chelating agent for trace elements in fertilizer, concrete additive.
In addition, it is also widely used in pulp & paper making, leather & textiles processing, electroplating, painting, photographic processing, metal pickling, cosmetics, intermediate, cleaning agent, petroleum processing aids, oxidant stabilizers, etc.

DTPMP is generally used as scale inhibitor with a concentration of 1-30 ppm (mg/L).
As cleaning agent with a concentration of 1000-2000mg/L.
It is usually used in conjunction with polycarboxylic acid-type dispersant and scale inhibitor.
When used in other industries, the dosage should be determined according to the test.

Technical Data:
Appearance Brownish yellow or brownish red viscous liquid
Content of active components (as DTPMP), ≥50.0%
Phosphite (PO33-) content, ≤3.0%
pH(1% aqueous solution) ≤2.0
Density(20℃), 1.35~1.45 g/cm3
Chloride (as Cl-), ≤17%
Fe (as Fe2+) content, ≤35mg/L

Package and storage:
25KG per plastic drum, 250KG drum, 1250KG IBC, or according to customer’s requirement.
Store in cool place indoors, storage period is 12 months.

Safety and protection
It is acidic, pay attention when operating, avoid contact with skin, eyes, etc., and rinse with plenty of water after contact.

Related Chelating Agents

Traditonal Chelating Agents:
Aminopolycarboxylates: EDTA, EDTA-Na/K, DTPA & DTPA-5Na/5K
Polyphosphonates: HEDP, DTPMP, ATMP

Green Chelating Agents:

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