Process for recycling noble metal catalysts used for the manufac

Details Process for recycling noble metal catalysts used for the manufac Process for recycling noble metal catalysts used for the manufac

1980-11-10

1982-03-09

Breitenstein, G. T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 24, C07C125073, C07C125065

Patent

active

043190359

ABSTRACT:
A process for the preparation of an aromatic urethane by the reaction in solution of an aromatic nitro compound or aromatic amine in the presence of an oxidation agent, with a hydroxyl compound and carbon monoxide in the presence of a noble metal catalyst, the improvement which comprises (a) treating the reaction solution, containing the noble metal catalyst, after the urethane formation is complete, with hydrogen (b) separating the noble metal in elementary form from the reaction solution, and (c) reusing the noble metal, together with a hydrohalic acid, as a catalyst.

REFERENCES:
patent: 2963444 (1960-12-01), Nixon
Metayer, Chem. Absts., 47, 4290(f), 1953.

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