1-Hydroxy Ethylidene-1,1-Diphosphonic Acid

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid

  • 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
Packaging: HEDP liquid: 200L plastic drum,IBC(1000L),customers` requirement.
Place of Origin: China

Product Description

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. It can dissolve the oxidized materials on these metals` surfaces. 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 ordnary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance are better than that of other organophosphoric acids (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.

The solid state of HEDP 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

Colorless or light yellow transparent liquid

White crystal powder

Active content(HEDP)%

58.0-62.0

90.0min

Phosphorous acid(as PO33-)%

1.0max

0.8max

Phosphoric acid (as PO43- )%

0.6max

0.5max

Chloride (as Cl-)% ppm

100.0max

50.0max

pH(1%solution)

2.0max

2max

Density(20)g/cm3

1.43-1.47

-

Fe,mg/l

10max

5.0max

Colour APHA (Hazen)

30max

-

 

Usage

HEDP is 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, 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, 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. 

 

Package and storage

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

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

Storage for ten months in shady room and dry place.

 

Safety protection

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

 

Keywords:

HEDP;HEDP(A);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

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