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Etidronic acid HEDP CAS 2809-21-4, also called 1-Hydroxyethylidene-1,1-diphosphonic acid, 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.

Specification of HEDP

HEDP 58%-62% liquid

Appearance                                     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 g/cm3                                 1.43-1.47
Fe,mg/L                                          10.0 max
Colour APHA (Hazen)                       30.0 max
Ca sequestration (mg CaCO3/g)        500.0 min

HEDP 98% solid

Application of HEDP

HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field and low pressure boilers in fields