• Description

Chemical Family :water treatment chemicals

Product Name :HEDPNa

Chemical Name : (1-hydroxyethylidene)bisphosphonic acid, sodium salt

CAS No : 29329-71-3

Details :

Monosodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDPNa)

CAS No. 29329-71-3

Molecular Formula:  C2H7O7P2Na           

Molecular weight: 228



HEDPNa is an organophosphonic acid corrosion inhibitor, it can chelate with Fe, Cu, and Zn ions. HEDPNa can dissolve the oxidized materials, it has good scale and corrosion inhibition effects even under 250°C, it is stable under high pH value, not easy to be hydrolyzed, not easy to be decomposed under normal light and heat condition, its acid/alkaline and chloride oxidation tolerance are better than that of other organophosph-onic acids. HEDPNa can form six-ring chelating compounds with metal ions in water system, Ca2+ in particular. HEDPNa has good scale inhibition effects and obvious dissolution threshold effects. When used with other Water Treatment Chemicals, the synergistic effects is better.

HEDPNa is suitable for acidic scale inhibitor and detergent, can be used for metal surface treatment. . 


items index
Appearance Colorless or light yellow transparent liquid
Active content (HEDP)% 19.0-21.0
Fe  ppm 20 max
PH (1% water solution) 2.3-2.9
Density (20°C) g/cm3 1.11-1.21


HEDPNa is used in circulating cool water system, medium and low pressure boiler, oil field water pipelines as scale and corrosion inhibitor in fields such as power plant, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, this product is used as detergent for metal and nonmetal. In dyeing industry, this product is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, this product is used as chelating agent.

When used as scale inhibitor, the dosage 2-20mg/L is preferred, when used as corrosion inhibitor, the dosage 20-100mg/L is preferred, when used as cleaning agent, the dosage 1000-2000mg/L is preferred. Usually, HEDPNa is used together with polycarboxylic acid .

Package and Storage:

Normally In 250kg net Plastic Drum, IBC drum can also be used as required. Storage for ten months in room shady and dry place.

Safety Protection:

Acidity, Avoid contact with eye and skin, once contacted, flush with water.

Related Products:Disodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid ( HEDPNa2 )
Related Products:Disodium phosphate
Related Products:ferric sulfate (Poly ferric sulphate)
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