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1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
HEDP
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CAS No.: 2809-21-4
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Molecular Formula: C2H8O7P2
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Synonyms: HEDPA, Etidronic Acid, Dequest 2010 1-Hydroxy-1,1-Ethanediyl Ester |
Molecular Feight: 206.02 |
Properties:
HEDP chelates with Fe, Cu, and Zn ions to form stable chelating compounds. It can dissolve the oxidized materials on these metals’ surfaces. HEDP has excellent scale and corrosion inhibition effects under temperature 250℃.
The stability under high pH value is very good, and it is hard to be hydrolyzed, hard to be decomposed under ordinary light and heat conditions. The acid/alkali and chlorine oxidation tolerance are better than that of other organophosphoric acids (salt).
HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.Because of its high purity of solid HEDP, it can be used as cleaning agent in electronic fields and as additives in daily chemicals.
Specification:
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Items |
Index |
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Appearance |
Clear, colorless to pale yellow aqueous solution |
White crystal powder |
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Active content (HEDP)% |
58.0-62.0 |
90.0 min |
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Active content (HEDP·H2O)% |
- |
98.0 min |
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Phosphorous acid (as PO33-)% |
2.0 max |
0.8 max |
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Phosphoric acid (asPO43-)% |
0.8 max |
0.5 max |
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Chloride (as Cl-) % |
1.0 max |
0.1 max |
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pH (1% solution) |
2.0 max |
2.0 max |
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Density (20℃)g/cm3 |
1.40 |
- |
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Fe mg/L |
10.0 max |
5.0 max |
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, it is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as chelating agent.
Package:
Liquid: 200L plastic drum,IBC(1000L), as per requirement.
Solid: 25kg/bag, as per requirement.