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Water Treatment Chemicals CAS No 2809-21-4 1-Hydroxyethylidene-1, 1-Diphosphonic Acid 98% HEDP

CAS No. 2809-21-4
Molecular Formula: C2H8O7P2
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.
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  • HEDP 98%

  • SINOBIO

  • 2931900090

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




CAS No.   2809-21-4

Molecular Formula:   C2H8O7P2                                                                                         

Molecular weight:  206.02

Hazard class/UN No./Packaging: UN 3265 8/PG III

Structural Formula: 

325ff0b675fd4f6eef6d58c4afc2349a_HEDP


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°C. 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 chlo rine 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.




Properties:


HEDP is a kind of scale and corrosion inhibitor which belongs to organic phosphonic acid. It can form stable complexes with iron, copper, zinc and other metal ions, and can also dissolve the metal surface oxide. Under 250 ºC condition, HEDP can still play a good corrosion and scale inhibition effect.

HEDP can react with metal ions in water system to form hexa-element chelating complex, especially with calcium ions.

HEDP has good anti-scale and visible threshold effects. When used in combination with other water treatment chemicals, it shows ideal synergistic effects.

HEDP solid state is a high purity product, suitable for cold winter areas; Because of its high purity, it is especially used as the cleaning agents in electronics industry, and additives in daily chemicals.



Specification:


Item  Standard 
Appearance

White crystalline powder

Active content (as HEDP. H2O) (%) 98.0 min

Phosphorous acid as PO33- %

0.8 max

Phosphoric acid as PO43 %

0.5 max
Chloride as Cl  ppm 100 max
PH (1% solution) @20 °C 2.0 max
Iron content (Fe ppm) 20.0 max



Application:


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. 



Package and Storage:


HEDP 98% : 25kg,  25 MT with pallet, 27 MT without pallet


Storage for one year in shady room and dry place.

package  package

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