1-Hydroxy Ethylidene-1,1-Diphosphonic Acid HEDP 60% 98% CAS 2809-21-4
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Product Name: 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
Abbreviation: HEDP
CAS Number: 2809-21-4
Molecular Formula: C2H8O7P2
Molecular weight: 206.02
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 centigrade. 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.
HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boliers 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;
Specification
| Index Name | Specifications | Results |
| Appearance | Clear, Colorless to pale yellow aqueous solution | Clear, Colorless aqueous solution |
| Active Content(as HEDP),% | 58.0-62.0 | 60.10 |
| Phosphorous Acid (as PO33- ),% | 1.0max. | 0.46 |
| Phosphorous Acid (as PO43- ),% | 0.6max. | 0.17 |
| Acetic Acid, % | 0.5max. | 0.11 |
| Chloride(as Cl-) , ppm | 100.0max | 37.2 |
| PH (1% solution) | 2.0max | 1.70 |
| Density(20ºC) g/cm3 | 1.43-1.47 | 1.44 |
| Iron (as Fe) , ppm | 10.0max | 3.8 |
| Ca sequestration, mg CaCO3/g | 500.0min | 510.9 |
| Identification | Qualified | |
* We also have HEDP 98% powder
Packing
Solid: 25kg per bag,25mt per 20ft container
Liquid: 250kg per drum,80drums per 20ft container
