HEDP

• Category :

  Catalyst and Auxiliary

• 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;HEDP (Hydroxyethylidene Diphosphonic Acid);

• CAS NO :

  2809-21-4

• EC NO :

  220-552-8

• Molecular Formula :

  C₂H₈O₇P₂

• Molecular Weight :

  201.9987

• Main Specifications :

• InChI :

  InChI=1/C2H8O7P2/c1-2(3,10(4,5)6)11(7,8)9/h3H,1H3,(H2,4,5,6)(H2,7,8,9)/p-4

• Product description :

  Introduction s:

  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. 

  CAS No.2809-21-4

  Molecular Formula:C₂H₈O₇P₂

  Molecular weight: 206.02

  Technologies :

  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 (20℃)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

  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.

  Safety Protection:

  Acidity, a void contact with eye and skin, once contacted, flush with water .

  Package and Storage:

  HEDP liquid: 200L plastic drum, IBC(1000L),customers’ requirement. HEDP solid: 25kg/bag,customers’ requirement .

• Molecular Structure :