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      1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, HEDP

       

      CAS No. 2809-21-4                         Dequest:2010      EINECS: 220-552-8
      Molecular Formula: C2H8O7P2                Molecular weight: 206.02
      Structural Formula:


      Properties:
      HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds.It can dissolve the oxidized materials on these metals’ surfaces. HEDP shows excellent scale and corrosion inhibition effects under temperature 250℃. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance are better than that of other organophosphoric acids (salt). HEDP can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. Therefore, HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.
      The solid state of HEDP is crystal powder, suitable for usage in winter and freezing districts. Because of its high purity, it can be used as cleaning agent in electronic fields and as additives in daily chemicals. 
      Specification:


      items

      index

      Appearance

      Colorless or light yellow transparent liquid

      White crystal powder

      Active content (HEDP) % 

      58.0-62.0

      90 min

      Phosphorous acid (as PO33-)%

      2.0 max

      0.8 max

      Phosphoric acid (asPO43- ) %

      0.8 max

      0.5 max

      Chloride (as Cl-)%

      0.01 max

      0.01 max

      pH (1% solution)

      2 max

      2 max

      Density (20℃) g/cm3

      1.40

      Fe ion ppm

      10 max

      5 max

      Colour APHA (Hazen)

      30 max

      Usage and Dosage:
      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.
      Packing and Storage:

      HEDP liquid: Normally 250kg net in drum, IBC, or per customers.
       HEDP solid: 25kg in inner liner polyethylene (PE) bag, outer plastic woven bag, or confirmed by clients.
      Storage for ten months in room shady and dry place.
      Safety Protection:
      Acidity, Avoid contact with eye and skin, once contacted, flush with water immediately. 


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