Main Products
- Phosphonates Antiscalants, Corrosion
Inhibitors and Chelating Agents - Salts of Phosphonates
-
- Tetra Sodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP?Na4)
- Tetra Sodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP?Na4)
- 2-Phosphonobutane -1,2,4-Tricarboxylic Acid, Sodium salt (PBTC?Na4)
- Penta sodium salt of Amino Trimethylene Phosphonic Acid (ATMP?Na5)
- Hepta sodium salt of Diethylene Triamine Penta (Methylene Phosphonic Acid) (DTPMP?Na7)
- Potassium Salt of HexaMethylene-DiamineTetra (MethylenePhosphonic Acid) HMDTMPA?K6
- More
- Polycarboxylic antiscalant and dispersant
- Biodegradable antiscalant and dispersant
- Biocide and Algicide
- Built Scale & Corrosion Inhibitors and Pretreatment Filming Agents
-
- TH-907 Non-P Scale&Corrosion Inhibitor
- TH-503 Scale and Corrosion Inhibitor for Boiler
- TH-503B Scale and Corrosion Inhibitor for Boiler
- TH-504 Scale and Corrosion Inhibitor for Heating Water
- TH-601 Scale and Corrosion Inhibitor for Iron & Steel Plant
- TH-604 Scale and Corrosion Inhibitor for Power Plant
- More
- Corrosion Inhibitor
- Oxygen Scavenger
- Reverse Osmosis Chemicals
- Other
Shandong Taihe Technologies Co., Ltd.
TEL: +86-632-5113066
FAX: +86-632-5112055
E-mail: info@thwater.net
ADD: No.1, Shiliquan East Road, Shizhong District, Zaozhuang City, Shandong Province, P.R.China
 |
HOME >> Water Treatment Chemicals >> Phosphonates Antiscalants, Corrosion Inhibitors and Chelating Agents |
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
CAS No. 2809-21-4
Molecular Formula: C2H8O7P2 Molecular weight: 206.02
Structural Formula:
Properties:
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 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. 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid shows excellent scale and corrosion inhibition effects under temperature 250℃. 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 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). 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. Therefore, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.
The solid state of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 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 | Clear, Colorless to pale yellow aqueous solution | White crystal powder |
| Active content (HEDP)% | 60.0 min | 92.0 min |
| Active content (HEDP·H2O)% | - | 100.0 min |
| Phosphorous acid (as PO33-)% | 2.0 max | 0.8 max |
| Phosphoric acid (as PO43- )% | 0.8 max | 0.5 max |
| Chloride (as Cl-)% | 0.02 max | 0.01 max |
| pH (1% water solution) | 2.0 max | 2.0 max |
| Density (20℃)g/cm3 | 1.40 min | - |
| Fe, mg/L | 20.0 max | 10.0 max |
| Ca sequestration (mg CaCO3/g) | 500.0 min | |
Usage:
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 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, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid is used as detergent for metal and nonmetal. In dyeing industry, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 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, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid is used together with polycarboxylic acid.
Package and Storage:
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid liquid: 200L plastic drum,IBC(1000L),customers’ requirement.
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid solid: 25kg/bag,customers’ requirement.
Storage for twelve months in room shady and dry place.
Safety Protection:
Acidity, Avoid contact with eye and skin, once contacted, flush with water.
Synonyms:
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid;
Hydroxyethylidene-1,1-diphosphonicacid(HEDP);
1-Hydroxyethylidenediphosphonic Acid;
Hydroxyethylidene Diphosphonic acid(HEDP);
1-Hydroxy-1,1-Ethanediyl ester;
Oxyethylidenediphosphonic Acid(OEDP)
Оксиэтилидендифосфоновая кислота(ОЭДФ -кислота )