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HEDP 60%

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CAS No. 2809-21-4
Molecular Formula: C2H8O7P2
Molecular weight: 206.02



HEDP 60%


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 non-metal. 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.


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 hydrolysed, 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 anti-scale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.



Specification Sheet



Appearance Colorless or light yellow transparent liquid
Ca Sequestration  500.0 mg/gm
Active content(HEDP)% 58.0-62.0
Phosphorous acid(as PO33-)% 1.0 max
Phosphoric acid (asPO43 )% 0.6 max
Chloride (as Cl-)% 0.01 max
pH(1% solution) 2.0 max
Density (20℃)g/cm3 1.43 - 1.47
Fe ion ppm 10.0 max
Acetic Acid 0.5% max





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