Organic Phosphonic Acid

Ethylene Diamine Tetra(Methylene Phosphonic Acid)Sodium, EDTMPS

CAS No. 22036-77-7                                                                               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. It shows excellent scale inhibition ability under temperature 200℃. It can dissociate 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. EDTMPS shows better antiscale effects to calcium sulfate and barium sulfate. 

Specification:

items	index
Appearance	Clear yellow to umber transparent liquid
Active component (EDTMPS) %	30.0 min
Organic phosphonic acid (as PO43- ) %	10.0 min
Phosphorous acid (as PO33-)	5.0 % max
Phosphoric acid (as PO43- ) %	1.0 max
pH (1% water solution)	9.5-10.5
Density (20℃) g/cm3	1.25min
Chloride (as Cl-) %	3.0max

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.

Packing and Storage:

Normally 250kg net in drum, IBC, or per customers. Storage for ten months in shady room and dry places.

 Keywords: Ethylene Diamine Tetra (Methylene Phosphonic Acid) Sodium,EDTMPS,EDTMPS China

Update : 2015/2/2 10:30:40 Hits : 4692