Chemical Name | 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid |
Commodity Name | HEDP |
Molecular formula | C2 |
Molecular weight | 206.02 |
H.S.Code | 29319000 |
CAS No. | 2809- |
Technical Specification | Tech grade |
|
Appearance | Clear, Colorless to pale yellow aqueous solution | White crystal powder |
Active content (HEDP)% | 58.0-62.0 | 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-)% | 0.02 max | 0.01 max |
pH (1% water solution) | 2.0 max | 2.0 max |
Density (20℃)g/cm3 | 1.40 min | – |
Fe, mg/L | 20.0 max | 10.0 max |
Ca sequestration (mg CaCO3/g) | 500.0 min | – |
Characteristics:
• 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 250ºC. 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
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