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.
