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HOME >> Water Treatment Chemicals >> Phosphonates Antiscalants, Corrosion Inhibitors and Chelating Agents |
Hydroxyethylidene Diphosphonic
Acid
(HEDP)
CAS No. 2809-21-4
Molecular Formula: C2H8O7P2 Molecular weight: 206.02
Structural Formula:
Properties:
Hydroxyethylidene Diphosphonic acid(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. Hydroxyethylidene Diphosphonic acid(HEDP) shows excellent scale and corrosion inhibition effects under temperature 250℃. 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 are better than that of other organophosphoric acids (salt). Hydroxyethylidene Diphosphonic acid(HEDP) can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. Therefore, Hydroxyethylidene Diphosphonic acid(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 Hydroxyethylidene Diphosphonic acid(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), % | 58-62 | 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-), ppm | 100.0 max | 100.0max |
| pH (1% water solution) | 2.0 max | 2.0 max |
| Density (20℃), g/cm3 | 1.43-1.47 | - |
| Fe, mg/L | 20.0 max | 10.0 max |
| Color APHA (Hazen) | 40.0 max | - |
| Ca Sequestration (mg CaCO3/g) | 500.0 min | |
Usage:
Hydroxyethylidene Diphosphonic acid(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, Hydroxyethylidene Diphosphonic acid(HEDP) is used as detergent for metal and nonmetal. In dyeing industry, Hydroxyethylidene Diphosphonic acid(HEDP) is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, Hydroxyethylidene Diphosphonic acid(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, Hydroxyethylidene Diphosphonic acid(HEDP) is used together with polycarboxylic acid.
Package and Storage:
Hydroxyethylidene Diphosphonic acid(HEDP) liquid:HEDP liquid: 200L plastic drum,IBC(1000L),customers' requirement.
Hydroxyethylidene Diphosphonic acid(HEDP) solid: 25kg/bag,customers' requirement.
Storage for ten months in shady room and dry place.
Safety Protection:
Acidity, Avoid contact with eye and skin, once contacted, flush with water.
Synonyms:
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid;
Hydroxyethylidene-1,1-diphosphonicacid(HEDP);
1-Hydroxyethylidenediphosphonic Acid;
Hydroxyethylidene Diphosphonic acid(HEDP);