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1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
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| Post Date: | Aug 05,2013 |
| Expiry Date: | Feb 01,2014 |
| Detailed Description: |
Cas No. :2809-21-4
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: PRODUCT index Appearance Clear, Colorless to pale yellow aqueous solution Active content (HEDP)% 58.0-62.0 Phosphorous acid (as PO33-)% 1.0 max Phosphoric acid (asPO43- )% 0.6 max Chloride (as Cl-) ppm 100.0 max pH (1% solution) 2.0 max Density (20℃)g/cm3 1.43-1.47 Fe，mg/L 10.0 max Colour APHA (Hazen) 30.0 max Acetic acid % 0.5 max Ca sequestration (mg CaCO3/g) 500.0 min solid index Appearance White crystal powder Active content (HEDP)% 90.0min Phosphorous acid (as PO33-)% 0.8 max Phosphoric acid (asPO43- )% 0.5 max Chloride (as Cl-) ppm 100.0max pH (1% solution) 2.0 max Fe，mg/L 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, 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 |
| CAS Registry Number: | 2809-21-4 |
| Synonyms: | ;1-Hydroxyethane-1,1-diphosphonic Acid;Etidronic acid;HEDP;HEDPA; Hydroxy Ethylidene-1,1-Diphosphonic Acid;1-Hydroxy Ethylidene-1,1-Diphosphonic Acid;1-Hydroxyethylidene diphosphonic Acid;1-hydroxy ethylene-1,1-diphosphonic acid;1-HYDROXYETHYLIDENEDI(PHOSPHONIC ACID);disodium (1-hydroxyethane-1,1-diyl)bis[hydrogen(phosphonate)];(1-hydroxyethane-1,1-diyl)bis(phosphonate);Hydroxyethylidenedi(phosphonic acid);Hydroxyethylidine Diphosphonic Acid; |
| Molecular Formula: | C2H8O7P2 |
| Molecular Weight: | 201.9987 |
| Molecular Structure: | 
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| Company: | Shandong Taihe Water Treatment Co., Ltd [ China ] |
| Contact: | mable hou |
| Tel: | +86-632-5113066 |
| Fax: | +86-632-5112055 |
| Email: | mable@thwater.net |
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