Main Products

Phosphonates Antiscalants, Corrosion
Inhibitors and Chelating Agents
- 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
- 2-Phosphonobutane -1,2,4-Tricarboxylic Acid (PBTC)
- Amino Trimethylene Phosphonic Acid (ATMP)
- Diethylene Triamine Penta (Methylene Phosphonic Acid) (DTPMPA)
- 2-Hydroxy Phosphonoacetic Acid (HPAA)
- More
Salts of Phosphonates
- Tetra Sodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP鈥a₄)
- Tetra Sodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP鈥a₄)
- 2-Phosphonobutane -1,2,4-Tricarboxylic Acid, Sodium salt (PBTC鈥a₄)
- Penta sodium salt of Amino Trimethylene Phosphonic Acid (ATMP鈥a₅)
- Hepta sodium salt of Diethylene Triamine Penta (Methylene Phosphonic Acid) (DTPMP鈥a₇)
- Potassium Salt of HexaMethylene-DiamineTetra (MethylenePhosphonic Acid) HMDTMPA鈥₆
- More
Polycarboxylic Antiscalant and Dispersant
- Polyacrylic Acid (PAA) 50%
- Polyacrylic Acid Sodium Salt (PAAS) 45%
- Hydrolyzed Polymaleic Anhydride (HPMA)
- Acrylic Acid-2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AA/AMPS)
- Copolymer of Maleic and Acrylic Acid (MA/AA)
- More
Biodegradable Antiscalant and Dispersant
- Sodium of Polyepoxysuccinic Acid (PESA)
- Sodium Salt of Polyaspartic Acid (PASP)
Biocide and Algicide
- Dodecyl Dimethyl Benzyl Ammonium Chloride (Benzalkonium Chloride)(DDBAC/BKC)
- Isothiazolinones (CMIT/MIT)
- GLUTARALDEHYDE
- Tetrakis(hydroxymethyl)phosphonium sulfate(THPS)
- More
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
- Sodium salt of Tolyltriazole (TTA鈥a)
- Tolyltriazole (TTA)
- Sodium salt of 1,2,3-Benzotriazole (BTA鈥a)
- 1,2,3-Benzotriazole (BTA)
- Corrosion Inhibitor for Hydrochloric Acid Cleaning
- More
Oxygen Scavenger
- Cyclohexylamine
- Morpholine
Reverse Osmosis Chemicals
- TH-0100 Antiscalant and Dispersant for RO Membrane
- TH-150 Antiscalant and Dispersant for RO Membrane
- TH-200 Antiscalant and Dispersant for RO Membrane
- TH-191 Antiscalant and Dispersant for RO Membrane
- More
Other
- Sodium Diethylhexyl Sulfosuccinate
- Acetyl chloride
- TH-GC Green Chelating Agent (Glutamic Acid,N,N-diacetic Acid, Tetra Sodium Salt)
- Fatty Alkyl Dimethyl Amine Oxides

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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:

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

Properties:

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鈥?surfaces. HEDP shows excellent scale and corrosion inhibition effects under temperature 250鈩? 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.

The solid state of HEDP 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)%	58.0-62.0	90.0 min
Active content (HEDP·H₂O)%	-	98.0 min
Phosphorous acid (as PO₃^3-⁾%	2.0 max	0.8 max
Phosphoric acid (as PO₄^3- )%	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鈩?g/cm³	1.40 min	-
Fe, mg/L	20.0 max	10.0 max
Ca sequestration (mg CaCO₃/g)	500.0 min

Usage:

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. 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.