dvr HEDP 60%

HEDP ACID chemical name is Hydroxy Ethylidene -1,1-Diphosphonic acid manufacturer, supplier and exporter. HEDP is  organophosphonate compound which have chemical properties of sequestration, deflocculation, threshold inhibition and hydrolytic stability etc. 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%u2019 surfaces.

Technical Specifications:

Chemical Name : 1 Hydroxy ethylidene 1,1-diphosphonic Acid or HEDP 60%  Synonyms : 1-Hydroxyethylidene-1,1- Diphosphonic Acid.
CAS No. : 2809-21-4
Molecular Weight : 206 / Molecular Formula : C2H8O7P2
Appearance : Clear / pale yellow Solution
Active Content : 60 + 2%
Specific gravity @ 25°C : 1.42 %u20131.46
pH (1% solution) : Less than 2
Chlorides as HCl : < 0.01 %
Phosphorous acid : < 2.5 %
Acetic acid : < 0.5 %
Iron Content (ppm) : < 20
Solubility : Soluble in water 
Assay : 60.0%.
Chelation Value : 520.0


At high temperature of 250 Deg C HEDP also resulting good corrosion and antiscaling effect. 

It's good resistance towards High and Low pH value makes it unique and better than that of other organophosphoric acids (salt). HEDP also resulting high chlorine oxidation tolerance properties.

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. 

Synthesis / Manufacturing Process of HEDP:
The primary raw materials used to manufacture HEDP are acetic anhydride and either phosphorus acid or phosphorus Trichloride. The phosphorus trichloride is converted to phosphorus acid within the reaction vessel, and then reacts with the acetic anhydride.

Uses / Application of HEDP
HEDP is used as a strong Chelating Agent for Metal Ions like Ca, Mg & Fe in water Treatment, Textile, Sugar Processing, Dye, Soaps & Detergents.


RXSOL-81-8160-250 chemically having wide range of applications including scale prevention and corrosion inhibition in water treatment. 

Hydroxy Ethylidene -1,1-Diphosphonic acid is organophosphonate with multifunctional properties like sequestration, deflocculation, threshold inhibition and hydrolytic stability, as a single active ingredient. Because of the combination of these properties Hydroxy Ethylidene -1,1-Diphosphonic acid has a wide range of applications. One of the most important applications is in scale prevention and corrosion inhibition in water treatment. 

Using Procedure:

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. It is used as a strong chelating agent for metal ions like Ca, Mg & Fe in water treatment, textile applications. Its efficient inhibition for CaCO3 & CaSO4 alone or in combination with low molecular weight polymers. Very effective in protecting metal corrosion. HEDP also having very strong chlorine stability. 

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