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Hydroxyethyl diphosphonic acid(Etidronic acid) is an organic compound, the solid is white crystalline particles, the dissolved water is colorless to light yellow liquid. This product is soluble in water, soluble in methanol and ethanol. It has a large dissociation constant in water and can form stable complexes with metal ions. It can form stable adducts with compounds containing active oxygen to keep active oxygen stable.
CAS No.: 2809-21-4
EINECS No.: 220-552-8
Molecular Formula: C2H8O7P2
Molecular Weight: 206.02
RIDADR: UN 3265 8/PG III
Specification of HEDP :
Items | Index | |
Appearance | Clear, Colorless to pale yellow aqueous solution | White crystal powder |
Active content (HEDP)% | 60.0 min | 90.0 min |
Active content (HEDP·H2O)% | - | 98.0 min |
Phosphorous acid (as PO33-)% | 1.0 max | 0.8 max |
Phosphoric acid (as PO43- )% | 0.6 max | 0.5 max |
Chloride (as Cl-)% | 0.01 max | 0.01 max |
pH (1% water solution) | 2.0 max | 2.0 max |
Density (20ºC)g/cm3 | 1.40 min | - |
Fe, mg/L | 10.0 max | 5.0 max |
Colour APHA (Hazen) | 10.0 max | - |
Ca sequestration (mg CaCO3/g) | 500.0 min | - |
HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc..
In light woven industry, HEDP is used as detergent for metal and nonmetal.
In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent;
In non-cyanide electroplating, HEDP is used as chelating agent.
The dosage of 1-10mg/L is preferred as scale inhibitor, 10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid.
HEDP Liquid: Normally in 200L HDPE drum, 1000L IBC, or customers' requirement.
HEDP Solid: 25kg inner liner PE bag, 1000kg woven bag, or customers' requirement.
Storage for ten months in room shady and dry place.
