Recovery of noble metal values from carbonylation residues using

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

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502 24, 260546, 260549, C01G 5500

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active

046055410

ABSTRACT:
Heavy residues produced by noble metal catalyzed carbonylation reactions and containing Group VIII noble metals, particularly rhodium, are treated with a mixture of immiscible liquids to precipitate solids containing substantially all of the noble metal contained in the residues. The solids may be returned directly for reuse in the carbonylation reaction. One group of liquids consists of water with immiscible alcohols or hydrocarbons, or mixtures thereof. A second group consists of acetic anhydride with immiscible hydrocarbons.

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patent: 4440570 (1984-04-01), Erpenbach et al.
patent: 4442304 (1984-04-01), Erpenbach et al.
patent: 4473655 (1984-09-01), Tsunoda et al.
patent: 4557760 (1985-12-01), Erpenbach et al.

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