Recovery of rhodium from carbonylation residues

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Platinum group metal

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252413, 252414, 252415, 260546, 260549, C01G 5500

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active

043405703

ABSTRACT:
Residues are formed in the carbonylation of esters or ethers, particularly in the production of acetic anhydride or ethylidene diacetate. Such residues contain noble metal, typically rhodium used as a catalyst, which must be recovered before the residues can be disposed of. In the process of the invention, the rhodium values are freed from the residues by a series of treatments with amines and other reagents, thereby enabling the rhodium to be extracted by subsequent contact with an aqueous halogen acid.

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