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*-Hydroxy Ethylidene*1, *-Diphosphonic Acid (HEDP)
CAS No.: ********4
Molecular Formula:
C2H8O7P2
Molecular weight: **6.*2
Structural Formula:
Properties:
HEDP is an organphosphoric 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 **0℃. 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 organ phosphoric
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 Colorless or light brown liquid White crystal
powder
Active content (HEDP)% ≥ *0.0
*0.0 *9.0
Phosphorous acid (as
PO**-)%≤ 2.0 2.0
0.*0
Phosphoric acid (asPO**- )%
≤ 0.8 0.8 0.*0
Chloride (as Cl-)%≤
1.0 1.0 0.*0
pH (1ï¼… solution)
≤ 2
2 2.0
Density (*0℃)g/cm3≥ 1.*4
1.*0 ——
Fe ion ppm
≤ *0 *0
5.0
Active content (as HEDP•H2O )% ≥ —— *8.0
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, ***** In
light woven industry, HEDP is used as detergent for metal and
nonmetal. In dyeing industry, HEDP is used as peroxide
stabilize
