CAS No. 2809-21-4
Molecular Formula: C2H8O7P2
Molecular weight: 206.02
Structural Formula:
Properties:
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid 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.
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid shows
excellent scale and corrosion inhibition effects under
temperature 250℃.
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid
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).
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid
can react with metal ions in water system to form
hexa-element chelating complex, with calcium ion in
particular. Therefore,
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid has good antiscale and
visible threshold effects. When built together with other
water treatment chemicals, it shows good synergistic
effects.
The solid state of
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid 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:
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid
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,
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid is used as
detergent for metal and nonmetal. In dyeing industry,
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid is used as
peroxide stabilizer and dye-fixing agent; In non-cyanide
electroplating,
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid 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,
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid is used together with
polycarboxylic acid.
Package and Storage:
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid
liquid: 200L plastic drum,IBC(1000L),customers’ requirement.
1-Hydroxy
Ethylidene-1,1-Diphosphonic Acid 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)
