HEDP.Na2 CAS 7414-83-7
HEDP.Na2 is an organophosphonic acid corrosion and scale inhibitor. It forms stable chelates with Fe, Cu, and Zn ions to dissolve oxidized materials on metal surfaces.
- Chelating Ability: Forms stable six-membered ring complexes with metal ions in aqueous solutions, particularly Ca2+.
- Synergistic Effect: Exhibits a distinct threshold effect and excellent synergistic performance when combined with other water treatment chemicals.
- Chemical Stability: Exceptional tolerance to acid, alkali, and chlorine oxidation compared to standard organophosphones.
HEDP-Na2 Description
NAME: HEDP.Na2 & Etidronate disodium
Synonyms: HEDP Disodium Salt / Hydroxy Ethylidene Diphosphonic Disodium / Disodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid / Disodium Ethydronate
Molecular Formula: C2H6O7P2Na2
Molecular weight: 250
CAS NO.: 7414-83-7
Density: N/A
Boiling point: 578.8ºC at 760 mmHg
Melting point: > 300ºC
Flashing point: 303.8ºC
Appearance: Colorless to light yellow transparent liquid / White crystalline powder
Solubility: Soluble in water and ethanol, strong hygroscopicity.
Properties:
1. HEDP•Na2 is an organophosphonic acid corrosion inhibitor, it can chelate with Fe, Cu, and Zn ions, it can dissolve the oxidized materials, it has good scale and corrosion inhibition effects even under 250℃, it is stable under high pH value, not easy to be hydrolyzed, not easy to be decomposed under normal light and heat condition, its acid/alkaline and chloride oxidation tolerance are better than that of other organophosph-onic acids.
2. HEDP•Na2 can form six-ring chelating compounds with metal ions in water system, Ca2+ in particular. HEDP•Na2 has good scale inhibition effects and obvious dissolution threshold effects. When used with other Water Treatment Chemicals, the synergistic effects is better.
Package and Storage:
Liquid: 200L plastic drum, IBC(1000L), customers’ requirement.
Storage for twelve months in shady room and dry place.
Solid: 25kg/bag, customers’ requirement.
Storage for ten months in shady room and dry place.
Safety Protection: Weak acidity, Avoid contact with eye and skin, once contacted, flush with water.
Hot tags: Didronel; Fostex NZ 2; Ostedron; Aquavin HEDP Disodium Salt 270
HEDP-Na2 Technical
| Item | Index | |
| Standard | Solid | |
| Appearance | Colorless to light yellow transparent liquid | White powder |
| Active content (HEDP) % | 16.5 min | 74.0-79.0 |
| Active content (HEDP•Na2) % | 20.0 min | 89.8-95.8 |
| Density (20℃)g/cm3 | 1.12-1.22 | – |
| Fe, mg/L | – | 20.0 max |
| Moisture, % | – | 3.0-6.0 |
| PH (1% water solution) | 4.0-6.0 | 4.0-6.0 |
HEDP-Na2 Applications
HEDP.Na2 is widely utilized across various industrial sectors:
- Industrial Water Treatment: Acts as an effective scale and corrosion inhibitor in circulating cooling water systems, medium/low-pressure boilers, and oilfield water injection pipelines across power generation, chemical, metallurgy, and fertilizer industries.
- Textile & Dyeing Industry: Serves as a peroxide stabilizer and color-fixing agent.
- Light & Metal Industry: Functions as a non-cyanide electroplating chelating agent and a metal/non-metal cleaning agent.
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