Hedp - Shandong Jinlong Chemical Co.,Ltd

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid

HEDP

CAS No. 2809-21-4

Molecular Formula: C2H8O7P2 Molecular weight: 206.02

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, HEDPhas 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.

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, HEDPis 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:

HEDPliquid: Normally In 250kg net Plastic Drum, IBC drum can also be used as

required HEDPsolid: 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.

HEDP 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	-