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1-Hydroxy Ethylidene-1,1-Diphosphonic Acid Description
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
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 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 | |
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DALIAN CHEM --Dalian Chem Imp. and Exp. Group Co., Ltd.is focus on the supply of chemical raw materials, chemical products , and other related products since 1985.
At present, we provide more than 200 kinds of chemical raw materials and ingredients.HEDP is one of our main products.
A wide variety of HEDP options are available to you. Before HEDP order , we can send the sample for your testing ,We ensure the quality is the same as bulk quantity.
There are many HEDP suppliers, mainly located in Asia. The HEDP we supply is cheap and the quality is guaranteed. HEDP products are popular all over the world.
For whateverquestions about us or our products you may have, do let us know and you can be assured we reply you in details with 24 hours and to your satisfaction.
