Recovery of catalyst systems from diarylcarbonate-containing rea

Details Recovery of catalyst systems from diarylcarbonate-containing rea Recovery of catalyst systems from diarylcarbonate-containing rea

1997-04-01

1998-10-20

Ambrose, Michael G.

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

Organic compounds

Carbonate esters

558271, 558272, 558273, C07C 6800

Patent

active

058248161

ABSTRACT:
Catalyst systems with a content of a platinum-group-metal catalyst, a co-catalyst, a quaternary salt and a base for the oxidative carbonylation of aromatic hydroxy compounds to the corresponding diaryl carbonates are obtained according to the invention as a residual melt by melt crystallization and can be returned into the carbonylation reaction or worked up to valuable materials. The melt crystallizate, which consists predominantly of diaryl carbonate and the parent aromatic hydroxy compound, is worked up to pure diaryl carbonate and pure hydroxy compound.

REFERENCES:
patent: 5239106 (1993-08-01), Shafer
patent: 5495038 (1996-02-01), Buysch et al.
Orbit Abstract of EP 0 218 545 (Apr. 15, 1987).
Orbit Abstract of EP 0 521 499 (Jan. 07, 1993).
Orbit Abstract of EP 0 687 666 (Dec. 20, 1995).

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