HEDP·Na2
Disodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
CAS NO7414-83-7
Mol. WT.250.00
Mol. FormulaC2H6O7P2Na2
Structure
- Properties
- Specification
- Usage
- Safety
- Package&Storage
HEDP•Na2 is an organophosphonic acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions, and dissolve the oxidized materials. This salt has good scale and corrosion inhibition effects even under 250℃. HEDP•Na2 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. HEDP•Na2 can form six-ring chelating compounds with metal ions in water system, Ca2+ in particular. It has good scale inhibition effects and obvious dissolution threshold effects. When used with other water treatment chemicals, the synergistic effect is better.
| Items |
Index |
| Appearance |
Colorless to light yellow transparent liquid |
White powder |
| Active component (HEDP)% |
16.5 min |
74.0-79.0 |
| Active content（HEDP•Na2）% |
20.0 min |
89.8 min |
| Density (20℃)g/cm3 |
1.12-1.22 |
-- |
| Fe（Fe3+），ppm |
-- |
35 max |
| Phosphorous acid (PO33-)% |
-- |
2 max |
| Moisture，% |
-- |
3-6 |
| pH (1% water solution) |
4.0-6.0 |
4.0-6.0 |
HEDP•Na2 is widely used in circulating cool water system, medium and low pressure boiler, oil field water pipelines as scale and corrosion inhibitor in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP•Na2 is used as detergent for metal and nonmetal. In dyeing industry, HEDP•Na2 is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP•Na2 is used as chelating agent.
Weak acidity. Avoid contact with eye and skin. In case of contact, flush with water immediately.
30Kg/250Kg net in plastic drum, or as customers’ requirement. Storage for twelve months in shady room with good ventilation.
