CAS No. 3794-83-0(4-Na) 29329-71-3（x-Na）
Synonym: Tetra Sodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP Na4)； HEDP 4Na； HEDP Na4
Molecular formula: C2H4O7P2 Na4
Relative molecular mass: 294
Structural formula
Performance and usage
HEDP Na4 is the sodium salt of HEDP and is an excellent inhibitor of calcium carbonate scale. HEDP Na4 is mainly used for metal corrosion inhibition in low-pressure boiler water treatment, circulating water treatment, industrial municipal cleaning water, and swimming pool sterilization.
This product is white powder solid, easily soluble in water, does not absorb moisture, is convenient for transportation, and is suitable for use in severe cold conditions. HEDP Na4 is an organic phosphonate scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve the oxides on the metal surface. It still plays a good role in corrosion and scale inhibition at 250℃.
HEDP Na4 is widely used in electric power, chemical industry, metallurgy, chemical fertilizer and other industrial circulating cooling water systems, as well as scale and corrosion inhibition of medium and low pressure boilers, oil field water injection and oil pipelines; HEDP Na4 can be used as Metal & non-metal cleaning agent in textile industry; peroxide stabilizer and color fixing agent in bleaching and dyeing industry, complexing agent in cyanide-free electroplating industry, and daily chemical additives.
Specifications
Items | Standards |
Appearance | Colorless or light yellow transparent liquid | White powder |
Active ingredient (calculated as HEDP) % | 20.3-21.7 | ≥56.0 |
Active ingredient (calculated as HEDP·Na4) % | 29.0-31.0 | ≥79.0 |
Orthophosphorus content (calculated as PO43-) % | 18.4-20.4 | 52.0-54.0 |
Fe (as Fe2+) content mg/L ≤ | 20.0 | 35.0 |
Loss on drying % ≤ | -- | 15.0 |
Density(20℃)g/cm3 | 1.26-1.36 | -- |
pH (1% aqueous solution) | 10.0-12.0 | 11.0-12.0 |
Packaging and storage
Liquid are packed in plastic barrels, 30KG or 250KG per barrel; solids are packed in plastic woven bags lined with polyethylene bags, with net weight of 25KG per bag, can also be custom-made according to user needs. Stored in a cool and ventilated indoor place, moisture-proof, valid for twelve months.
Security
This product is alkaline, pay attention to labor protection during operation, avoid contact with skin, eyes, etc., rinse with plenty of water after contact.
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