1-Hydroxy Ethylidene-1,1-Diphosphonic Acid

 HEDP

CAS No.2809-21-4                                     Dequest:2010
Molecular Formula:  C2H8O7P2               Molecular weight: 206.02
Structural Formula:

Properties:
HEDP is an organophosphoric acidcorrosion inhibitor. It can chelate with Fe, Cu, and Zn ions toform stable chelating compounds.It can dissolve the oxidizedmaterials on these metals` surfaces. HEDP shows excellent scale andcorrosion inhibition effects under temperature 250℃. HEDP has goodchemical stability under high pH value, hard to be hydrolyzed, andhard to be decomposed under ordinary light and heat conditions. Itsacid/alkali and chlorine oxidation tolerance are better than thatof other organophosphoric acids (salt). HEDP can react with metalions in water system to form hexa-element chelating complex, withcalcium ion in particular. Therefore, HEDP has good antiscale andvisible threshold effects. When built together with other watertreatment chemicals, it shows good synergistic effects.
The solid state of HEDP is crystal powder, suitable for usage inwinter and freezing districts. Because of its high purity, it canbe used as cleaning agent in electronic fields and as additives indaily chemicals.