Disodium Hydroxyethylidene Diphosphonate HEDP·Na2

Disodium Hydroxyethylidene Diphosphonate HEDP·Na2

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CAS No. 7414-83-7

Synonym: disodium hydroxyethylene diphosphonate, sodium etidronate, HEDP 2Na, HEDP Na2

Molecular formula: C2H4O7P2 Na2 Relative molecular mass: 250

Structural formula

1. Performance and usage

HEDP Na2 is an organic phosphonic acid scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve the oxides on the metal surface. HEDP Na2 can still play a good role in corrosion and scale inhibition at 250℃, and it is still stable at high pH, not easy to be hydrolyzed, and not easy to decompose under general photothermal conditions. The acid and alkali resistance and chlorine oxidation resistance are better than other organic phosphonic acids (salts). It can form a six-ring chelate with metal ions in water, especially calcium ions, so it has good scale inhibition effect and obvious solubility limit effect. When used in combination with other water treatment agents, it shows an ideal synergistic effect. HEDP Na2 is widely used in electric power, chemical industry, metallurgy, chemical fertilizer and other industrial circulating cooling water systems, as well as scale and corrosion inhibition of medium and low pressure boilers, oil field water injection and oil pipelines; HEDP Na2 can be used as Metal & non-metal cleaning agent in textile industry; peroxide stabilizer and color fixing agent in bleaching and dyeing industry, complexing agent in cyanide-free electroplating industry.




          ----                   HG/T2839-2010


Colorless or light yellow transparent liquid

White powder

Active ingredient (calculated as HEDP) %             ≥



Active ingredient (calculated as HEDP·Na2) %        ≥



Orthophosphorus content (calculated as PO43-) %              ≤



Phosphorous acid (asPO33-) % ≤



Fe (as Fe2+) content mg/L    ≤             






pH (1% aqueous solution)



3. Packaging and storage

Liquid are packed in plastic barrels, 30KG or 250KG per barrel; solids are packed in plastic woven bags lined with polyethylene bags, with net weight of 25KG per bag, can also be custom-made according to user needs. Stored in a cool and ventilated indoor place, moisture-proof, valid for twelve months.

4.safety protection

This product is alkaline, pay attention to labor protection during operation, avoid contact with skin, eyes, etc., use plenty of water after contact

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