Recovery of catalytically-useful cobalt and like metal moieties

Details Recovery of catalytically-useful cobalt and like metal moieties Recovery of catalytically-useful cobalt and like metal moieties

1982-03-02

1983-07-19

Hearn, Brian E.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 49, 423150, 562531, 562536, 562566, 252413, C07C 51235, C07C 5507, C01G 5100, C01G 300

Patent

active

043943551

ABSTRACT:
The solid oxalate of a catalytic metal such as cobalt, typically formed as an undesired and useless by-product during the liquid-phase oxidation of an organic compound, typically a hydrocarbon, in the presence of a homogeneous catalyst comprising said metal, is treated to convert the metal moiety to a reusable form by a process comprising leaching the metal oxalate with an aqueous solution of a soluble salt of ethylenediaminetetraacetic acid (EDTA). The resulting solution of EDTA-metal complex or chelate is then mixed with a soluble calcium salt to precipitate the oxalate moiety as insoluble calcium oxalate leaving the metal-EDTA complex in solution. After removing the resulting solid calcium oxalate, the remaining filtrate is acidified to convert the metal moiety to a simple salt which can be recycled to the liquid-phase oxidation, while the EDTA is precipitated as a solid which can also be recovered and re-used in the complexation step of the process.

REFERENCES:
patent: 3138637 (1964-06-01), Lindstrom
patent: 3492340 (1970-01-01), Aguilo
patent: 3634070 (1972-01-01), Lindstrom
patent: 3780096 (1973-12-01), Johnson
patent: 3840469 (1974-10-01), Hobbs
patent: 3880920 (1975-04-01), Wampfler
patent: 4246185 (1981-01-01), Wood
patent: 4289708 (1981-09-01), Scott

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