Hydroxyethylene diphosphonate CAS 3794-83-0, also known as tetrasodium 1-hydroxyethylidene diphosphonate; HEDP tetrasodium; Tetrasodium hydroxyethylidene diphosphonate; Hydroxyethylene diphosphate; Tetrasodium hydroxyethylphosphate; HEDPoNa4; Tetrasodium hydroxyethylidene diphosphonate. Mainly used for metal corrosion inhibition in low-pressure boiler water treatment, circulating water treatment, industrial and municipal cleaning water, and swimming pool sterilization. CAS number: 3794-83-0.

Chinese name: Hydroxyethylene diphosphate

Foreign name: 1-Hydroxyethylidene) bis phononic acid tetrasodium salt

Nickname: Tetrasodium 1-hydroxyethylidene diphosphonate; HEDP tetrasodium; Tetrasodium hydroxyethylidene diphosphonate; Hydroxyethylene diphosphate; Tetrasodium hydroxyethylphosphate, HEDPoNa4; Tetrasodium hydroxyethylidene diphosphonate

CAS number: 3794-83-0

EINECS number: 223-267-7

Molecular formula: C2H8Na4O7P2

Molecular weight: 297.9851

Physical property data

Appearance colorless to slightly yellow transparent liquid, white powder solid active component (calculated by HEDP)% 20.3-21.7 ≥ 56.0 active component (calculated by HEDP · Na4)% 29.0-31.0 ≥ 79.9 total phosphorus (calculated by PO43-) content% 18.4-20.452.0-54.0 iron (calculated by Fe3+) content ppm ≤ 2035.0 dry weight loss% ≤ -15 density (20 ℃) g/cm3 1.26-1.36- pH value 10.0-12.0 (original solution) 11.0-12.0 (1% aqueous solution)

Main purpose

HEDP · Na4 is a sodium salt of HEDP and an excellent inhibitor of calcium carbonate scale. HEDP · Na4 is mainly used for metal corrosion inhibition in low-pressure boiler water treatment, circulating water treatment, industrial and municipal clean water, and swimming pool sterilization. HEDP · Na4 is a white powder solid, easily soluble in water, non hygroscopic, convenient for transportation, and suitable for use in severe cold conditions. HEDP · Na4 is an organic phosphonate scale and corrosion inhibitor that can form stable complexes with various metal ions such as iron, copper, and zinc, and can dissolve oxides on metal surfaces. It still has a good corrosion and scale inhibition effect at 250 ℃.

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