Production of chromium trioxide

Details Production of chromium trioxide Production of chromium trioxide

1983-06-28

1984-02-14

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423 53, 423520, 423551, C01G 37033

Patent

active

044316259

ABSTRACT:
Chromium trioxide is made by reacting sodium dichromate with sulphuric acid in an aqueous reaction mixture, evaporating the resultant liquor to cause crystallization of most of the chromium trioxide and to cause the concentration of sodium sulphates to be close to but below that at which sulphate crystals start to form, and separating the chromium trioxide crystals from the evaporated liquor. The liquor may then be cooled so as to cause crystallization of sodium sulphates, generally as sodium bisulphate, and the resultant liquor, after separation of the crystals, may be recycled to the reaction mixture containing dichromate and sulphuric acid.

REFERENCES:
patent: 2034256 (1936-03-01), Vetter
patent: 2632688 (1953-03-01), Perrin
patent: 3002815 (1961-10-01), Heinze

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