CAS No. 2809-21-4
Molecular Formula: C2H8O7P2
Molecular weight: 206.02
Structural Formula:
Properties:
HEDPA
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.
HEDPA
shows excellent scale and corrosion inhibition
effects under temperature 250℃.
HEDPA
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).
HEDPA
can react with metal
ions in water system to form hexa-element chelating complex,
with calcium ion in particular. Therefore,
HEDPA
has good
antiscale and visible threshold effects. When built together
with other water treatment chemicals, it shows good
synergistic effects.
The solid state of
HEDPA
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)%
|
58.0-62.0 |
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 |
|
Usage:
HEDPA
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,
HEDPA
is used as detergent for metal and nonmetal. In
dyeing industry,
HEDPA
is used as peroxide stabilizer and dye-fixing agent; In
non-cyanide electroplating,
HEDPA
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,
HEDPA
is used together
with polycarboxylic acid.
Package and Storage:
HEDPA
liquid: 200L plastic drum,IBC(1000L),customers’ requirement.
HEDPA
solid: 25kg/bag,customers’ requirement.
Storage for twelve months in room shady and dry
place.
Safety Protection:
Acidity, Avoid contact with eye and skin,
once contacted, flush with water.
Synonyms:
HEDP;HEDP(A);HEDPA;
Etidronic Acid;
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid;
Hydroxyethylidene-1,1-diphosphonicacid(HEDP);
1-Hydroxyethylidenediphosphonic Acid;
Hydroxyethylidene Diphosphonic acid(HEDP);
1-Hydroxy-1,1-Ethanediyl ester;
Oxyethylidenediphosphonic Acid(OEDP)
