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Molecular Formula: C2H8O7P2

CAS No.: 2809-21-4

Alias: HEDPA

Molecular Formula: C2H8O7P2

Molecular Weight: 206.02

Structural Formula:

Water Treatment Chemical 60% HEDP CAS 2809-21-4 Hydroxyethylidene Diphosphonic Acid

Properties & Use

It is an organic phosphoric acid series antiincrustation corrosion inhibitor. It has good stability in high pH-value conditions; has good resistance to acids/alkali and oxidation.

HEDP is widely used for electrical power, chemical engineering, metallurgy and chemical fertilizer industries.

Applications:

items	index
Appearance	Clear, Colorless to pale yellow aqueous solution
Active content (HEDP)%	58.0-62.0
Phosphorous acid (as PO33-)%	1.0 max
Phosphoric acid (asPO43- )%	0.8 max
Chloride (as Cl-) ppm	100.0 max
pH (1% solution)	2.0 max
Density (20℃)g/cm3	1.43-1.47
Fe,mg/L	10.0 max
Colour APHA (Hazen)	30.0 max
Acetic acid %	0.5 max
Ca sequestration (mg CaCO3/g)	500.0 min

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Synonyms:

HEDP;HEDP(A);ETIDRONIC ACID;1-Hydroxy Ethylidene-1,1-Diphosphonic Acid; Hydroxyethylidene-1,1-diphosphonicacid(HEDP); 1-HYDROXYETHYLIDENEDIPHOSPHONIC ACID;Hydroxyethylidene Diphosphonic acid(HEDP); 1-hydroxy-1,1-Ethanediyl ester