Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1980-07-15
1982-02-02
Vertiz, O. R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423319, 423320, C01B 2516
Patent
active
043139191
ABSTRACT:
A process, for removing solid impurities from impure phosphoric acid containing solids, comprising:
(a) passing said acid at an elevated temperature through a filter cake of a phosphoric acid-resistant filter aid supported on a porous medium, thereby to cause at least a portion of said solid impurities of said acid to be filtered therefrom and to be retained by said filter cake;
(b) contacting at least a portion of said filter cake with a displacing liquid, maintained at a temperature and in an amount sufficient to cause at least a portion of the acid which remains in said filter cake to pass through said filter cake without fracturing said filter cake;
(c) collecting said filtered acid which passes through said filter cake; and
(d) removing an impurity-containing portion of said filter cake after contact with said acid and displacing liquid, thereby to present a fresh surface for subsequent filtration.
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Daigle Michael A.
Harvey James P.
Richards Thomas E.
Bisson Barry A.
Heller Gregory A.
Occidental Chemical Company
Patrick W. N.
Vertiz O. R.
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