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HEDP
CAS No.
2809-21-4
Dequest:2010
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:
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items
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index
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Appearance
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Colorless or light yellow transparent
liquid
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White crystal powder
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Active content（HEDP）％
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58.0-62.0
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89.0 min
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Phosphorous acid（as
PO33-）%
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2.0 max
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0.5 max
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Phosphoric acid（asPO43-）%
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0.8 max
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0.5 max
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Chloride (as Cl-)%
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0.01 max
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0.01 max
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pH（1％
solution）
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2 max
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2 max
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Density（20℃）g/cm3
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1.40
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—
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Fe ion ppm
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10 max
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20 max
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Colour APHA (Hazen)
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40 max
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—
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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: Normally In 250kg net Plastic Drum, IBC drum
can also be used as required HEDP solid: 25kg inner liner
polyethylene (PE) bag, outer plastic woven bag, or
confirmed by clients.
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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