Process for purifying and recovering contaminated catalyst solut

Details Process for purifying and recovering contaminated catalyst solut Process for purifying and recovering contaminated catalyst solut

1982-07-29

1984-04-03

Konopka, P. E.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

260546, 260549, 423 22, 502 24, 502 32, 560232, 546182, 546347, 548345, 568 9, C22B 1100, C01G 5500, C07F 954, C07D21306

Patent

active

044405707

ABSTRACT:
The disclosure relates to a process for purifying and recovering a contaminated catalyst solution which is obtained in the carbonylation of methyl acetate and/or dimethylether, the catalyst solution containing carbonyl complexes of noble metals of group VIII of the Periodic System of the elements, quaternary heterocyclic aromatic nitrogen compounds or quaternary organophosphorus compounds as organic promoters, undistillable organic contaminants as well as acetic acid, acetic anhydride and ethylidene diacetate. To this end, the disclosure provides for the catalyst solution to be distillatively freed from its volatile constituents and for the remaining solid distillation residue to be water-treated, the noble metal/carbonyl-complex being precipitated together with the organic contaminants and the organic promoter becoming dissolved; for the precipitated and contaminated noble metal/carbonyl-complex to be removed by filtration and for the noble metal to be recovered terefrom in known fashion; for the organic promoter to be recovered by evaporating the water or extracting it with halogenated hydrocarbons and for these latter to be evaporated.

REFERENCES:
patent: 2839580 (1958-06-01), Hughes et al.
patent: 3821311 (1974-06-01), Hughes et al.
patent: 4013584 (1977-03-01), Knifton
patent: 4287089 (1981-09-01), Convers et al.
patent: 4333884 (1982-06-01), Kubbeler et al.

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