Process for the production of chromium trioxide

Details Process for the production of chromium trioxide Process for the production of chromium trioxide

1980-02-11

1981-09-22

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423607, C01G 37033

Patent

active

042910005

ABSTRACT:
Chromium trioxide contaminated with sulphate is purified by washing with an aqueous purifying wash liquor, generally water or aqueous chromic acid, while at a temperature above 50.degree. C. and centrifuging the washed product. Washing is generally conducted on the centrifuge. The chromium trioxide is preferably made by reacting sodium dichromate with from 2.4 to 2.8 mols sulphuric acid. The process can be operated to produce a novel product consisting of crystalline, non-fused, chromium trioxide that is substantially pure. The novel product can be in the form of pellets.

REFERENCES:
patent: 322011 (1885-07-01), Rowell
patent: 1429912 (1922-09-01), D'Adrian
patent: 2034256 (1936-03-01), Vitter
patent: 2632688 (1953-03-01), Perrin
patent: 3002815 (1961-10-01), Heizc
patent: 3592609 (1971-07-01), Honbo
patent: 3607026 (1971-09-01), Perrin et al.

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