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Hydroxyethylidene Diphosphonic Acid (HEDP)

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Hydroxyethylidene Diphosphonic Acid (HEDP) is widely used as scale and corrosion inhibitor in industrial circulating cooling water systems of electric power, chemical industry, metallurgy, chemical fertilizer, and also in medium or low pressure boilers, oilfield water injection and oil pipeline.

Quantity:
  • HEDP
  • ThFine
  • CAS No. 2809-21-4
  • Hydroxyethylidene Diphosphonic Acid

Hydroxyethylidene Diphosphonic Acid (HEDP)


CAS No.: 2809-21-4                                     EINECS No.: 220-552-8

Molecular Formula: C2H8O7P2                        Molecular Weight: 206.02

RIDADR: UN 3265 8/PG III

Structural Formula: 

 

HEDP.gif

 

Properties: 

Hydroxyethylidene Diphosphonic Acid (HEDP) is a kind of scale and corrosion inhibitor which belongs to organic phosphonic acid. It can form stable complexes with iron, copper, zinc and other metal ions, and can also dissolve the metal surface oxide. Under 250 ℃ condition, Hydroxyethylidene Diphosphonic Acid (HEDP) can still play a good corrosion and scale inhibition effect. 

Hydroxyethylidene Diphosphonic Acid (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 show better than that of other organic phosphonic acid (salt) acids (salt). 

Hydroxyethylidene Diphosphonic Acid (HEDP) can react with metal ions in water system to form hexa-element chelating complex, especially with calcium ions. Therefore, Hydroxyethylidene Diphosphonic Acid (HEDP) has good anti-scale and visible threshold effects. When used in combination with other water treatment chemicals, it shows ideal synergistic effects.

Hydroxyethylidene Diphosphonic Acid (HEDP) solid state is a high purity product, suitable for cold winter areas; Because of its high purity, it is especially used as the cleaning agents in electronics industry, and additives in daily chemicals.


Applications:

Hydroxyethylidene Diphosphonic Acid (HEDP) is widely used as scale and corrosion inhibitor in industrial circulating cooling water systems of electric power, chemical industry, metallurgy, chemical fertilizer, and also in medium or low pressure boilers, oilfield water injection and oil pipeline.

Besides these applications, Hydroxyethylidene Diphosphonic Acid (HEDP) can also be used as cleaning agent of metal and nonmetal in the textile industry, as peroxide stabilizer and fixing agent in bleaching and dyeing industry, as complexing agent in cyanide free electroplating industry, as the carrier of radioactive elements in pharmaceutical industry, and so on.


Specification:

Items

Index

Appearance

Clear, Colorless to pale yellow aqueous solution

White crystal powder

Active content (HEDP)%

60.0 min

90.0 min

Active content (HEDP·H2O)%

-

98.0 min

Phosphorous acid (as PO33-)%

1.0 max

0.8 max

Phosphoric acid  (as PO43- )%

0.6 max

0.5 max

Chloride (as Cl-)%

0.01 max

0.01 max

pH (1% water solution)

2.0 max

2.0 max

Density  (20℃)g/cm3

1.40 min

-

Fe, mg/L

10.0 max

5.0 max

Colour APHA (Hazen)

10.0 max

-

Ca sequestration (mg CaCO3/g)

500.0 min

-


      Usage:

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:

Hydroxyethylidene Diphosphonic Acid (HEDP) Liquid: Normally in 200L HDPE drum, 1000L IBC, or customers’ requirement.

Hydroxyethylidene Diphosphonic Acid (HEDP) Solid: 25kg inner liner PE bag, 1000kg woven bag, or customers’ requirement.

Storage for ten months in room shady and dry place.

Package.jpg

 

Safety Protection:

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

 

Synonyms:

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; 

Oxyethylidenediphosphonic Acid (OEDP);

Оксиэтилидендифосфоновая кислота(ОЭДФ -кислота);



Phosphonates Antiscalants, Corrosion Inhibitors and Chelating Agents

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