Process for recovering noble metals belonging to group VIII of t

Details Process for recovering noble metals belonging to group VIII of t Process for recovering noble metals belonging to group VIII of t

1984-05-29

1985-12-10

Doll, John

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

423 22, 502 22, 502 24, 502 33, 560232, C01G 5500

Patent

active

045577609

ABSTRACT:
In this process for recovering noble metals of group VIII from a contaminated catalyst solution originating from the carbonylation of methyl acetate and/or dimethylether (the catalyst solution containing carbonyl complexes of these noble metals, organic or inorganic promoters, undistillable organic contaminants as well as volatiles) the volatiles are distillatively removed from the catalyst solution and the remaining distillation residue is water-treated, whereby the noble metal/carbonyl-complex is precipitated together with the organic contaminants and is separated from the aqueous phase, while the promotor is dissolved and recovered in conventional manner. The noble metals are then set free in elemental form by subjecting the noble metal/carbonyl-complex separated and contaminated with organic polymers at temperatures of 150.degree. to 300.degree. C. to treatment with an ethyleneglycoldialkylether solvent of the formula R(--OCH.sub.2 --CH.sub.2).sub.n --OR, in which n stands for a number of from 1 to 4 and R stands for identical or different alkyl groups having from 1 to 6 carbon atoms. The noble metal can then be recovered by filtration, and the solvent can be freed of organic contaminants by distillation.

REFERENCES:
patent: 4131640 (1978-12-01), von Kutepow et al.
patent: 4340569 (1982-07-01), Davidson et al.
patent: 4340570 (1982-07-01), Davidson
patent: 4341741 (1982-07-01), Davidson et al.
patent: 4440570 (1984-04-01), Erpenbach et al.
patent: 4476237 (1984-10-01), Porcelli
patent: 4476238 (1984-10-01), Palmer et al.

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