CAS No. 2809-21-4
Molecular Formula: C2H8O7P2 Molecular weight: 206.02
Structural Formula:
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:
| Items | Index | |
|---|---|---|
| Appearance | Clear, Colorless to pale yellow aqueous solution | White crystal powder |
| Active content (HEDP), % | 58-62 | 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-), ppm | 100.0 max | 100.0max |
| pH (1% water solution) | 2.0 max | 2.0 max |
| Density (20℃), g/cm3 | 1.43-1.47 | - |
| Fe, mg/L | 20.0 max | 10.0 max |
| Color APHA (Hazen) | 40.0 max | - |
| Ca Sequestration (mg CaCO3/g) | 500.0 min | |
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 acid.
Package and Storage:
HEDP liquid: 200L plastic drum,IBC(1000L),customers’ requirement.
HEDP solid: 25kg/bag,customers’ requirement.
Storage for ten months in room shady and dry place.
Safety Protection:
Acidity, Avoid contact with eye and skin, once contacted, flush with water.
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