Water Treatment Chemicals, Phosphonates, Polymers, Biocides

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Organophosphoric Antiscale and Corrosion Inhibitors, Chelant

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

CAS No.: 2809-21-4

Molecular Formula:C2H8O7P2

Molecular weight: 206.02

Structural Formula:

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

Properties:

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP) is an organophosphoric acid corrosion inhibitor. HEDP can chelate with Fe, Cu, and Zn ions to form stable chelating compounds. HEDP can dissolve the oxidized materials on these metals’ surfaces. It shows excellent scale and corrosion inhibition effects under temperature 250℃. 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP) has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordnary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance are better than that of other organophosphoric acids (salt). 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 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.

The solid state of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 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:

items index
Appearance Clear, Colorless to pale yellow aqueous solution White crystal powder
Active content (HEDP)% 58.0-62.0 90.0 min
Phosphorous acid (as PO33-)% 1.0 max 0.8 max
Phosphoric acid  (asPO43- )% 0.6 max 0.5 max
Chloride (as Cl-) ppm 100.0 max 50.0max
pH (1% solution) 2.0 max 2.0 max
Density  (20℃)g/cm3 1.43-1.47 -
Fe,mg/L 10.0 max 5.0 max
Colour APHA (Hazen) 30.0 max -

Usage:

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP) Used as scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc. In light woven industry, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP) is used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent; in non-cyanide electroplating, it 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, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP) is used together with polycarboxylic acid.

Package and Storage:

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

Relevent:

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP) Chelating
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid(HEDP) supplier
Etidronic acid

contact us

Shandong IRO Water Treatment Co., Ltd.

Office Address: No.42-60, Zhongshan RD, Qingdao, Shandong, China
Factory Address: Qicun Town, Shizhong, Zaozhuang, Shandong, China
Tel: +86-532-85027466 Fax: +86 532 85028486
Email: info@irowater.com

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