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

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 

ordinary 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

Clear, Colorless to pale yellow aqueous solution

White crystal powder

Active content (HEDP)%

58.0-62.0

90.0min

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

100.0max

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

-

Acetic acid %

0.5 max

 

Ca sequestration (mg CaCO3/g)

500.0 min

 

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  helating  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 room shady and dry place.

Safety Protection:

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

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

Cnhile Chemical Industrial Science&Technology Co.,Ltd is a specialized manufacturer of water treatment chemicals in China for above 15 years. And we are also the biggest ATMP manufacturer in China. We have more than 10 series and several tens of kinds of water treatment agents. They are mainly used in oilfield, power plant, steel plant, textile&dying, etc. We have cooperation with many big companies, such as Sinopec.Our mainly products show as below:Acetyl chloride, ATMP, HEDP, EDTMPS, HPAA, PAAS, PAPE, PBTCA, HPMA, MA-AA, PCA, Phosphorous acid, DTPMP, PAA, Corrosion inhibitor, corrosion, water treatment chemical, water treatment, rust, chelant, water condition, anti-scale, scale inhibitor, TTA, BTA, AMPS,MBT [ Buying Categories ] - Chemicals >> Other Organic Chemicals