Tetra sodium salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid HEDP•Na4
Alias: Sodium tetrahydroxy ethyl diphosphonate
CAS No.3794-83-0(4-Na),29329-71-3(x-Na)
Molecular formula C2H4O7P2 Na4
Relative molecular mass: 294
Structural formula
Ⅰ. Performance and use
HEDP·Na4 is the sodium salt of HEDP and an excellent inhibitor of calcium carbonate scale. HEDP·Na4 is mainly used for low-pressure boiler water treatment, circulating water treatment, industrial municipal cleaning water, and metal corrosion inhibition of swimming pool sterilization.
HEDP·Na4 is a solid white powder, easily soluble in water, no moisture absorption, easy to transport, suitable for use in cold conditions. HEDP·Na4 is an organic phosphonate scale inhibitor and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions and dissolve oxides on the metal surface. It still has good corrosion and scale inhibition at 250℃.
HEDP·Na4 is widely used for scale and corrosion inhibition of industrial circulating cooling water, low-pressure boiler, oil field water injection and oil pipeline in power, chemical industry, metallurgy, chemical fertilizer, etc. HEDP·Na4 can be used as cleaning agent for metal and non-metal, peroxide stabilizer and color fixing agent for printing and dyeing industry, cyanide-free plating complexation agent, and daily chemical additive in light textile industry.
Ⅱ. Technical indicators
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Item
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Indicators
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Appearance
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Colorless to yellowish transparent liquid
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White powdery solid
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Active constituent（HEDP）/%
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20.3～21.7
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≥60.0
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Active constituent( HEDP·Na4)/%
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29.0～31.0
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≥85.0
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Dry weight loss %
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--
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≤9.0
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Total phosphorus( PO43-)/%
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18.4～20.4
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≥55.0
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pH（1% Aqueous solution）
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10.0～12.0
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11.0～12.0
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Density（20℃）/g·cm-3
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1.26～1.36
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--
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Fe content(Fe) /mg·L-1
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≤20.0
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≤35.0
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Ⅲ. Packaging and storage
HEDP·Na4 liquid shall be packed in plastic drums of 30kg or 250kg each, and HEDP·Na4 solid shall be packed in plastic woven bags lined with polyethylene bags, each bag net weight of 25kg, which can also be determined according to the user's needs. Stored indoors in a cool place for 12 months.
Ⅳ. Safety protection
HEDP·Na4 is alkaline, pay attention to labor protection during operation, should avoid contact with the skin, eyes, etc., after contact with plenty of water rinse.
