Ethylene Diamine Tetra (Methylene Phosphonic Acid) Sodium

EDTMPS

CAS No. 1429-50-1

Synonym: Dequest 2040

Molecular Formula: C6H12O12N2P4Na8

Molecular weight: 612.13

Structural Formula:

Properties:

EDTMPS is nitrogenous organic polyphosphonic acid, a part of cathodic corrosion inhibitor. Its corrosion

inhibition is 3~5 times better than that of inorganic polyphosphate. It can be fully dissolved in water, innocuous

and none pollution to environment, has good chemical stability and thermal tolerance.

EDTMPS shows excellent scale inhibition ability under temperature 200 ℃ . It dissociates into 8 positive-

negative ions, thus can chelate with many metal ions to form polymer reticulation complex, to destroy the

normal crystallization of calcium scale. It has better antiscale effectsto calcium sulfate and barium sulfate.

Specification:

Items                                                                                                                              Index

Appearance                                                                                       Clear yellow to umber transparent liquid

Active component (EDTMPS) %                                                                                28.0 min

Organic phosphonic acid (asPO43- ) %                                                                   10.0 min

Phosphorous acid (as PO33- ) %                                                                              5.0 max

Phosphoric acid (asPO43- ) %                                                                                  1.0 max

pH (1% water solution)                                                                                             9.5-10.5

Density (20℃) g/cm3                                                                                              1.25 min

Chloride (Cl- ) %                                                                                                       3.0 max

Usage:

EDTMPS can be used as corrosion inhibitor in circulating cool water system and boiler water. It is a

chelating agent in non-cyanogen electroplating industry and a water-softening agent in printing

dyeing industry. When used alone, 2~10mg/L is preferred. When built with HPMA by ratio

ETDMP:HPMA=1:3, it can be used for low pressure boiler. It can also be built with BTA, PAAS and zinc

salt.

Package and Storage:

200L plastic drum, IBC (1000L), customers’ requirement.

Storage for ten months in shady room and dry place.