Method for the recovery and reuse of cobalt and/or manganese com

Details Method for the recovery and reuse of cobalt and/or manganese com Method for the recovery and reuse of cobalt and/or manganese com

1982-12-21

1984-12-25

Sneed, Helen M. S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260439R, 562412, 562414, 562493, 562597, 502 24, C07F 1300, C07F 506

Patent

active

044902972

ABSTRACT:
A process is provided for the recovery and recycling of spent cobalt and/or manganese catalysts used in the air oxidation of alkyl aromatics in acetic acid. The catalysts are isolated in the form of oxalates of extremely low solubility from the acetic acid mother liquors and the cobalt oxalate dihydrate and/or manganese oxalate dihydrate catalysts are restored by the joint action of hydrogen bromide and acetic anhydride, acetyl bromide, or a mixture thereof, to a form in which they are soluble in acetic acid and can be used, again, as oxidation catalysts.

REFERENCES:
patent: 3332971 (1967-07-01), Elder et al.
patent: 3803191 (1974-04-01), Ehrreich et al.
patent: 3840469 (1974-10-01), Hobbs et al.
patent: 4170602 (1979-10-01), Deffeyes et al.
patent: 4314073 (1982-02-01), Crooks
patent: 4329493 (1982-05-01), Hashizume et al.
patent: 4346230 (1982-08-01), Hoffmann et al.

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