Process for the recovery of catalyst values

Details Process for the recovery of catalyst values Process for the recovery of catalyst values

1981-09-23

1983-06-14

Konopka, P. E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252414, 252415, 260549, 423 22, 562607, B01J 3140, B01J 2396, C07C 5110, C01G 5500

Patent

active

043882170

ABSTRACT:
Disclosed is a process for the recovery of catalyst values from a catalyst-tar solution derived from a production system in which acetic anhydride is prepared by carbonylating methyl acetate in the presence of rhodium, lithium and methyl iodide. The catalyst values are recovered by submitting the catalyst-tar solution to an extraction using methyl iodide and aqueous hydrogen iodide. The presence of hydrogen iodide in the aqueous phase stabilizes the rhodium in a water-soluble form and prevents rhodium losses due to the rhodium plating out on the process equipment.

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patent: 4340569 (1982-07-01), Davidson et al.
patent: 4340570 (1982-07-01), Davidson
patent: 4341741 (1982-07-01), Davidson et al.
patent: 4364907 (1982-12-01), Barnes

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