1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
(HEDP)

CAS No.  2809-21-4

Molecular Formula:   C₂H₈O₇P₂                Molecular weight: 206.02

Structural Formula:

Properties:

HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds. HEDP can dissolve the oxidized materials on these metals’ surfaces. Phosphonate HEDP shows excellent scale and corrosion inhibition effects under temperature 250℃. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance are better than that of other phosphonates (salt). HEDP can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. Therefore, HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.

HEDP Solid is crystal powder, suitable for usage in winter and freezing districts. Because of its high purity, it can be used as cleaning agent in electronic fields and as additives in daily chemicals.

Specification:

Usage:

As scale and corrosion inhibitor HEDP is widely used in low-pressure boilers, oil field pipeline and industrial circulating cooling water system in power plant, metallurgy, fertilizer and chemical industry.In light woven industry, HEDP is used as detergent for metal and nonmetal. In dyeing industry, phosphonate HEDP is used as peroxide stabilizer and dye-fixing agent. In non-cyanide electroplating, HEDP is used as chelating agent.

The dosage of 1-10mg/L is preferred as scale inhibitor, 10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid (PAA).

Package and Storage:

HEDP liquid: 200L plastic drum,IBC(1000L),customers' requirement.

HEDP solid: 25kg/bag,customers' requirement.

Storage for ten months in room shady and dry place.

Safety Protection:

Acidity, Avoid contact with eye and skin, once contacted, flush with water.　

Synonyms:

HEDP;HEDPA;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;

Oxyethylidenediphosphonic Acid(OEDP);