scale inhibitor and dispersant

1-      Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
Keywords:HEDP corrosion inhibitor  organophosphoric acids water treatment chemicals additives circulating cool water system scale inhibitor  corrosion inhibitor peroxide stabilizer
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 to form stable chelating compounds.It can dissolve the oxidized materials on these metals’ surfaces.HEDP shows excellentscale 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. Itsacid/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 otherwater treatment chemicals, it shows good synergistic effects.
The solid state ofHEDP is crystal powder, suitable for usage in winter and freezing districts. Because of its high purity, it can be used as cleaning agent inelectronic fields and asadditives 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 （as PO43 ）%
0.8max
0.5max
Chloride (as Cl-)%
1.0max
1.0max
pH（1％ solution）
2max
2max
Density （20℃）g/cm3
1.40
—
Fe，mg/L
10max
5max
Colour APHA (Hazen)
40max
—
Usage
HEDP is used asscale 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 asdetergent for metal and nonmetal. In dyeing industry,HEDP is used asperoxide stabilizer anddye-fixing agent; In non-cyanide electroplating,HEDP is used as chelating agent. The dosage of 1-10mg/L is preferred asscale inhibitor, 10-50mg/L ascorrosion inhibitor, and 1000-2000mg/L asdetergent. Usually,HEDP is used together withpolycarboxylic 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 and Protection
Acidity, Avoid contact with eye and skin, once contacted, flush with water.
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