Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1981-10-21
1983-04-19
Vertiz, O. R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423304, 423307, C01B 2516
Patent
active
043805310
ABSTRACT:
An improved process is provided for preparing highly purified phosphorus acid from industrial waste materials which are produced as by-products from the manufacture of sodium hypophosphite. Such industrial waste materials contain substantial quantities of calcium phosphite, and appreciable quantities of various metals such as iron, magnesium, aluminum and arsenic. The process of the present invention comprises, in a preferred embodiment thereof, reacting a slurry of said waste materials with sodium carbonate to produce calcium carbonate as a precipitate and a solution of sodium phosphite. The sodium phosphite solution is then passed through a cation ion exchange resin in the hydrogen form to produce a highly purified phosphorus acid product having significantly reduced quantities of metallic impurities.
REFERENCES:
patent: 1597984 (1926-08-01), La Bour
patent: 2976117 (1961-03-01), Pahud
patent: 3052519 (1962-09-01), Bianchi et al.
patent: 4330515 (1982-05-01), Campbell et al.
Ho Roland
Wisnouskas Joseph S.
Gosz William G.
Heller Gregory A.
Occidental Chemical Corporation
Tao James F.
Vertiz O. R.
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