Process for the removal of sodium oxalate compounds from Bayer s

Details Process for the removal of sodium oxalate compounds from Bayer s Process for the removal of sodium oxalate compounds from Bayer s

1984-03-08

1985-01-29

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423121, 423130, C01F 700, C01F 706

Patent

active

044965249

ABSTRACT:
A process is disclosed which provides for the removal of sodium oxalate compounds from a Bayer-type process liquor, after prior precipitation of aluminum hydroxide, which comprises: treating the liquor with ethanol in an amount up to 50 vol. % of the liquor to form a first layer comprising the ethanol and at least a portion of the caustic in the liquor, and a second layer comprising the liquor; and filtering at least the liquor layer to recover a sodium oxalate precipitate. Preferably, the liquor is concentrated to provide a caustic concentration of at least 200 and, most preferably, about 250 grams per liter total caustic (measured as sodium carbonate).

REFERENCES:
patent: 2806766 (1957-09-01), Anderson
patent: 3337305 (1967-08-01), Byrns
patent: 3457032 (1969-07-01), De La Breteque
patent: 3511606 (1970-05-01), Halff et al.
patent: 3649185 (1972-03-01), Sato et al.
patent: 3899571 (1975-08-01), Yamada et al.
patent: 4275042 (1981-06-01), Lever
patent: 4275043 (1981-06-01), Gnyra

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