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 |
Colorless
or light yellow transparent liquid |
White
crystal powder |
| Active content (HEDP)%
|
58.0-62.0 |
90.0min |
| Phosphorous acid (as
PO33-)% |
2.0 max |
0.8 max |
| Phosphoric acid
(asPO43-
)% |
0.8 max |
0.5 max |
| Chloride (as Cl-)% |
1.0 max |
0.1max |
| pH (1% solution) |
2 max |
2 max |
| Density (20℃)g/cm3 |
1.40 |
- |
| Fe，mg/L |
10 max |
5 max |
| Colour APHA (Hazen) |
40 max |
- |
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: Normally In 250kg net Plastic Drum, IBC drum
can also be used as required
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 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.
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
