CAS No. 2809-21-4
Molecular Formula: C2H8O7P2
Molecular weight: 206.02
Structural Formula:
Properties:
Hydroxyethylidene Diphosphonic acid(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.
Hydroxyethylidene Diphosphonic acid(HEDP) shows excellent scale and corrosion inhibition effects
under temperature 250℃. Hydroxyethylidene Diphosphonic acid(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).
Hydroxyethylidene Diphosphonic acid(HEDP) can react with metal ions in water system to form hexa-element
chelating complex, with calcium ion in particular. Therefore,
Hydroxyethylidene Diphosphonic acid(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
Hydroxyethylidene Diphosphonic acid(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 |
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:
Hydroxyethylidene Diphosphonic acid(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,
Hydroxyethylidene Diphosphonic acid(HEDP) is used as detergent for metal and nonmetal. In dyeing
industry, Hydroxyethylidene Diphosphonic acid(HEDP) is used
as peroxide stabilizer and dye-fixing agent; In non-cyanide
electroplating,
Hydroxyethylidene Diphosphonic acid(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,
Hydroxyethylidene Diphosphonic acid(HEDP) is used together with
polycarboxylic acid.
Package and Storage:
Hydroxyethylidene Diphosphonic acid(HEDP) liquid: Normally In 250kg net Plastic Drum, IBC drum
can also be used as required
Hydroxyethylidene Diphosphonic acid(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 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
