Process for preparing pure sodium bichromate

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal

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423 58, 423596, 423597, 23302R, 23301R, 23305R, C01G 3714

Patent

active

039339726

ABSTRACT:
Processes for preparing vanadium- and chlorine-free sodium bichromate which comprises concentration of a sodium chromate liquor so as to cause formation of crystals of neutral sodium chromate tetrahydrate, separation of these crystals from their mother liquor, treatment thereof with sulfuric acid, concentration of the acid solution obtained, and after separation of insoluble sodium sulfate so formed, crystallization of sodium bichromate.

REFERENCES:
patent: 2583591 (1952-01-01), Penin et al.
patent: 2612435 (1952-09-01), Penin et al.
patent: 2839359 (1958-06-01), Dunning
patent: 3027245 (1962-03-01), Kearley
patent: 3137541 (1964-06-01), Cooke
patent: 3451766 (1969-06-01), Schafer et al.

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