Process for the production of sodium dichromate

Details Process for the production of sodium dichromate Process for the production of sodium dichromate

1989-04-24

1990-11-06

Morris, Theodore

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 55, 423 58, 423597, 423DIG2, C01G 3714

Patent

active

049685031

ABSTRACT:
A process for the production of sodium dichromate comprising reacting sodium chromate with acids, the acids being sulfuric acid and NaHSO.sub.4 formed as a waste product in the production of CrO.sub.3 and thus being contaminated with chromium compounds, adding PO.sub.4 ions in excess to the NaHSO.sub.4 contaminated with chromium compounds and precipitating the Cr(III) present therein as CrPO.sub.4 at a temperature of 50.degree. to 100.degree. C. and at a pH value of 3 to 6.

REFERENCES:
patent: 3715425 (1973-06-01), Morgan et al.
patent: 3784672 (1974-01-01), Morgan
patent: 3932598 (1976-01-01), Cooper et al.
patent: 4045340 (1977-08-01), Perrone
Chemical Abstract 89:114579p.

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