Mrasn Chemical Company
Our Products
Polymer Additives
Petrochemical Catalyst
Oil Drilling Chemicals
Molecular Sieve
Water Treatment Chemicals
Recycling Industry

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


CAS No.  2809-21-4
Molecular Formula:   C2H8O7P2               

Molecular weight: 206.02


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). HEDPcan 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

89.0 min

 

Phosphorous acid(as PO33-)%

2.0 max

0.5 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 min

 

Fe ion ppm

10 max

20 max

 

Colour APHA (Hazen)

40 max

 

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.