Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
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.
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Celanese Corporation
Hearn Brian E.
Pritchett Ralph M.
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