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CAS No. 2809-21-4 Dequest: 2010
Molecular
Formula: C2H8O7P2 Molecular weight: 206.02
Structural
Formula:
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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 |
Colorless or light yellow transparent liquid |
White crystal powder |
|
Active content（HEDP）％ |
58.0-62.0 |
90.0min |
|
Phosphorous acid（as PO33-）% |
2.0max |
0.5max |
|
Phosphoric acid （asPO43 ）% |
0.8max |
0.5max |
|
Chloride (as Cl-)% |
0.01max |
0.01max |
|
pH（1％ solution） |
2max |
2max |
|
Density （20℃）g/cm3 |
1.40 |
— |
|
Fe ion ppm |
10max |
20max |
|
Colour APHA (Hazen) |
40max |
— |
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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