Process for sodium hypophosphite

Details Process for sodium hypophosphite Process for sodium hypophosphite

1982-08-05

1983-04-05

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423158, 423181, 423DIG14, 210665, 210667, 210669, 210687, C01B 1516, C01B 2526

Patent

active

043791328

ABSTRACT:
Either commercial yellow phosphorus or a phosphorus sludge is reacted with a slurry of calcium hydroxide in aqueous sodium hydroxide to form a sodium hypophosphite solution containing calcium and hydroxide ions. The solution is neutralized with phosphoric acid or an acid phosphate salt with the co-production of an insoluble calcium phosphate. The neutral solution is contacted with an ion exchange resin charged with sodium ions to remove any remaining calcium ions.

REFERENCES:
patent: 2045097 (1936-06-01), Otting
patent: 2330865 (1943-10-01), Butzler
patent: 2376914 (1945-05-01), Gustafson
patent: 2701791 (1955-02-01), Lindsay
patent: 2938770 (1960-05-01), Pahud
patent: 2976117 (1961-03-01), Pahud
patent: 2976118 (1961-03-01), Pahud
Zobel, D., "The Piesteritz Hypophosphite Process", Chemisch-Technische Umschau, 10(1), 73-79, (1978).
Mellor, Inorganic and Theoretical Chemistry, vol. VIII, Supp. III, Phosphorus, Wiley-Interscience, NY (1971), pp. 621-623.

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