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

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

CAS No.  2809-21-4

Molecular Formula:   C2H8O7P2              

Molecular weight: 206.02

Package

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

HEDP solid: 25kg/bag.

 

Application

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.

 

Specification

Items

Index

Appearance

Clear, Colorless to pale yellow aqueous solution

White crystal powder

Active content (HEDP)%

58.0-62.0

90.0 min

Active content (HEDP·H2O)%

-

98.0 min

Phosphorous acid (as PO33-)%

2.0 max

0.8 max

Phosphoric acid  (as PO43- )%

0.8 max

0.5 max

Chloride (as Cl-)%

0.02 max

0.01 max

pH (1% water solution)

2.0 max

2.0 max

Density  (20℃)g/cm3

1.40 min

-

Fe, mg/L

20.0 max

10.0 max

Ca sequestration (mg CaCO3/g)

500.0 min

 

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