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1-Hydroxyethylidene-1,1-diphosphonic acid / HEDP CAS 2809-21-4

1-Hydroxyethylidene-1,1-diphosphonic acid HEDP CAS 2809-21-4
1-Hydroxyethylidene-1,1-diphosphonic acid HEDP CAS 2809-21-4
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1-Hydroxyethylidene-1,1-diphosphonic acid Details:
  • Chemical Name:1-Hydroxyethylidene-1,1-diphosphonic acid
  • CAS No.: 2809-21-4
  • EINECS No.:200-746-9
  • Molecular Fomula:C2H8O7P2
  • Molecular weight: 206.03
  • Appearance: White powder and Colorless liquid
  • Assay :98%min and 60%min
Hydroxyethylidene-1,1-diphosphonic acid Specification:
98% HEDP  
Appearance White Crystal Powder
Active Content( as HEDP)% 90.0 Min.
Active Content( as HEDP·H2O)% 98.0 Min.
Phosphorous Acid (as PO33-)% 0.8 Max.
Phosphorous Acid (as PO43-)% 0.5 Max.
PH (1% solution) 2.0 Max.
Chlorides (as CL-) ppm 100 Max.
Iron ppm 10 Max.
60% HEDP  
Item Index
Appearance colorless or pale yellow transparent liquid
ACTIVE CONTENT (as HEDP) % ≥ 60
PHOSPHOROUS ACID (as PO33-) % ≤ 2.0
PHOSPHORIC ACID (asPO43-) % ≤ 1.0
PH(1% solution) ≤ 2.0
Density (20℃)g/cm3 1.4
Fe ion ppm ≤ 10
Chloride (as Cl-)% ≤ 100ppm
Hydroxyethylidene-1,1-diphosphonic acid Application:

It is commonly used as scale and corrosion inhibitor in boiler water, circulating water and oilfield water injection. It is often compounded with polyhydroxy acid scale inhibitor and dispersant. It can also be used as cyanide-free electroplating complexing agent, fixing agent for bleaching and dyeing industry, and hydrogen peroxide stabilizer.

1-Hydroxyethylidene-1,1-diphosphonic acid Packaging Details

25kg/Drum or as your requirement

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