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

• Post Date:

  Mar 05,2013

• Expiry Date:

  Mar 05,2014

• Detailed Description:

  Cas No. :2809-21-4 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
  
  CAS No. 2809-21-4
  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 ordnary 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 90.0min
  Phosphorous acid(as PO33-)% 1.0max 0.8max
  Phosphoric acid (as PO43- )% 0.6max 0.5max
  Chloride (as Cl-)% ppm 100.0max 50.0max
  pH(1%solution) 2.0max 2max
  Density(20℃)g/cm3 1.43-1.47 —
  Fe,mg/l 10max 5.0max
  Colour APHA (Hazen) 30max —
  
  Usage
  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.
  
  Package and storage
  HEDP liquid: 200L plastic drum,IBC(1000L),customers’ requirement.
  HEDP solid: 25kg/bag,customers’ requirement.
  Storage for ten months in shady room and dry place.
  
  Safety protection
  Acidity, avoid contact with eye and skin, once contacted, flush with water.
  
  Keywords:
  HEDP;HEDP(A);HEDPA;ETIDRONIC ACID;1-Hydroxy Ethylidene-1,1-Diphosphonic Acid; Hydroxyethylidene-1,1-diphosphonicacid(HEDP); 1-HYDROXYETHYLIDENEDIPHOSPHONIC ACID;Hydroxyethylidene Diphosphonic acid(HEDP);1-hydroxy-1,1-Ethanediyl ester
  

• CAS Registry Number:

  2809-21-4

• Synonyms:

  ;1-Hydroxyethane-1,1-diphosphonic Acid;Etidronic acid;HEDP;HEDPA; Hydroxy Ethylidene-1,1-Diphosphonic Acid;1-Hydroxy Ethylidene-1,1-Diphosphonic Acid;1-Hydroxyethylidene diphosphonic Acid;1-hydroxy ethylene-1,1-diphosphonic acid;1-HYDROXYETHYLIDENEDI(PHOSPHONIC ACID);disodium (1-hydroxyethane-1,1-diyl)bis[hydrogen(phosphonate)];(1-hydroxyethane-1,1-diyl)bis(phosphonate);Hydroxyethylidenedi(phosphonic acid);Hydroxyethylidine Diphosphonic Acid;HydroxyEthylidene Diphosphonic acid;

• Molecular Formula:

  C₂H₈O₇P₂

• Molecular Weight:

  201.9987

• Molecular Structure:

  

• Company:

  Shandong IRO Water Treatment Co., Ltd     [ China ]        

• Contact:

  Sharon Li

• Tel:

  8653266888207

• Fax:

  8653285028486

• Email:

  info@irowater.com