1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) CAS No. 2809-21-4

CAS No. 2809-21-4Other name:HEDPAMolecular Formula: C2H8O7P2 Molecular weight: 206.02Structural Formula:
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Product Description

CAS No. 2809-21-4

Other name:HEDPA

Molecular Formula: C2H8O7P2

Molecular weight: 206.02

Structural Formula:

Properties:

HEDP is an organophosphorus 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 the 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. It's acid/alkali and chlorine oxidation tolerance is better than that of other organophosphorus acids (salt). HEDP can react with metal ions in the water system to form a 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. Its high purity can be used as a 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	90.0min
Phosphorous acid (as PO₃^3-)%	1.0 max	0.8 max
Phosphoric acid (asPO₄^3- )%	0.6 max	0.5 max
Chloride (as Cl^-) ppm	100.0 max	100.0max
pH (1% solution)	2.0 max	2.0 max
Density (20℃)g/cm³	1.43-1.47	-
Fe，mg/L	10.0 max	5.0 max
Colour APHA (Hazen)	30.0 max	-
Acetic acid %	0.5 max
Ca sequestration (mg CaCO₃/g)	500.0 min

Usage:

HEDP is used as scale and corrosion inhibition in circulating cool water systems, oil fields, and low-pressure boilers in electric power, chemical industry, metallurgy, fertilizer, etc. In the light woven industry, HEDP is used as detergent for metal and nonmetal. HEDP is used as a peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as a chelating agent. The dosage of 1-10mg/L is preferred as a scale inhibitor, 10-50mg/L as a corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid.

Package and Storage:

HEDP liquid: Normally, In 250kg net Plastic Drum, IBC drum can also be used as required. 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.