HEDP·Na4
Tetra sodium of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
CAS NO3794-83-0(4-Na);29329-71-3 (x-Na)
Mol. WT.294.00
Mol. FormulaC2H4O7P2 Na4
Structure
- Properties
- Specification
- Usage
- Safety
- Package&Storage
HEDP•Na4 is the sodium salt of HEDP. HEDP•Na4 is an good scale inhibitor for calcium carbonate. It is mainly used in low pressure boiler water system, circulating water system, industrial and municipal cleaning water system and swimming pool. The solid HEDP•Na4 is white powder, soluble in water, low hygroscopic, easy to transport and suitable for use in winter and freezing districts. It is a kind of organophorphonic acid scale and corrosion inhibitor, can form stable complex with Fe, Cu and Zn ions, and can dissolve the oxides on metal surface, It still has good scale and corrosion inhibition effect at the temperature of 250℃.
Items |
Index |
Appearance |
Colorless to yellowish transparent liquid |
White powder |
Active content (HEDP)% |
20.3-21.7 |
56.0 min |
Active content (HEDP•Na4)% |
29.0-31.0 |
79.9 min |
Total phosphoric acid (as PO43-) % |
18.4-20.4 |
52.0-54.0 |
Fe(Fe3+) , ppm |
20 max |
35.0 max |
Moisture, % |
-- |
15 max |
Density (20℃)g/cm3 |
1.26–1.36 |
-- |
pH |
10.0-12.0(as it) |
10.5-12.0 (1% water solution) |
HEDP•Na4 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•Na4 is used as detergent for metal and nonmetal. In dyeing industry, HEDP•Na4 is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating and daily chemicals additives.
Alkaline. Avoid contact with eye and skin. In case of contact, flush with water immediately.
HEDP•Na4 liquid: 30Kg/250Kg net in plastic drum. HEDP•Na4 solid: 25kg net in plastic woven bag.
Storage for twelve months in shady, cool and dry place with good ventilation.