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)%
|
58.0-62.0 |
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:
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 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)
