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

Jan 14, 2018

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

  • Model NO.: 60% liquid, 98% powder

  • Appearance: Liquid, Powder

  • Organic Peroxides Kind: Organic Acid

  • Packaging: Plastic Drum

  • Transport Package: 250kgs/Drum, 290kgs/Drum,1250kgs/IBC, 1300kgs/IBC,

  • Classification: Phosphorous Acid

  • Grade Standard: Industry Grade

  • Organic Peroxides Quality: Tech Grade

  • Element: Phosphorous Acid

  • Origin: China

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

Molecular Formula:C2H8O7P2                Molecular weight: 206.02
1, Organic Peroxides Properties
HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn etc. metal ions and form stable complex compound. It can dissolve the oxidized materials on these metals' surfaces. Under  250oC HEDP shows excellent scale and corrosion inhibition ability. 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 of HEDP is high purity product, suitable for using in winter and freezing districts. it is quite suitable for using as cleaning agent in electronic fields and as additives in daily chemicals. 
2, 1-Hydroxy Ethylidene-1, 1-Diphosphonic Acid (HEDP) Specification:

AppearanceClear, Colorless to pale yellow aqueous solutionWhite crystal powder
Active content (HEDP)%58.0-62.090.0 min
Active content (HEDP┬ĚH2O)%-98.0 min
Phosphorous acid (as PO33-)%1.0 max0.8 max
Phosphoric acid  (asPO43- )%0.6 max0.5 max
Chloride (as Cl-) ppm100.0 max50.0max
pH (1% solution)2.0 max2.0 max
Density  (20oC)g/cm31.43-1.47-
Fe,mg/L10.0 max5.0 max
Colour APHA (Hazen)30.0 max-
Acetic acid %0.5 max 
Ca sequestration (mg CaCO3/g)500.0 min 

3,HEDPApplication range&using method
HEDP is widely used in the in circulating cool water system of electric power, chemical industry, metallurgy, fertilizer, etc. and widely used as a scale and corrosion inhibitor of low-pressure boilers, field waterflood, oil pipeline.
In light&textile 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.
4,1-Hydroxy Ethylidene-1, 1-Diphosphonic Acid (HEDP) Package and Storage:
HEDP liquid: Normally In 250kg or 290kgs net Plastic Drum or 1250kgs or 1300kgs net IBC;
HEDP solid: 25kg inner liner polyethylene (PE) bag, outer plastic woven bag,
or confirmed by clients request.
Storage for ten months in room shady and dry place.
5,1-Hydroxy Ethylidene-1, 1-Diphosphonic Acid (HEDP) Safety Protection:
HEDP is Acidity, Avoid contact with eye and skin, once contacted, flush with water.

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