Method for preparing diaryl carbonates with improved selectivity

Details Method for preparing diaryl carbonates with improved selectivity Method for preparing diaryl carbonates with improved selectivity

1997-03-24

1998-06-02

Ambrose, Michael G.

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

Organic compounds

Carbonate esters

558270, 558271, 558272, 558273, C07C 6800, C07C 6996

Patent

active

057602727

ABSTRACT:
Hydroxyaromatic compounds such as phenol are converted to diaryl carbonates by reaction with oxygen and carbon monoxide in the presence of a catalyst package and an added diluent free from active hydrogen. The preferred catalyst packages comprise a Group VIIIB metal or salt thereof, an inorganic cocatalyst, and organic cocatalysts and a bromide or chloride source. The amount of added diluent is an effective amount to improve selectivity to diaryl carbonate. Preferred diluents are diphenyl carbonate and N-methylpyrrolidone.

REFERENCES:
patent: 4187242 (1980-02-01), Chalk
patent: 5231210 (1993-07-01), Joyce et al.
patent: 5284964 (1994-02-01), Pressman et al.
patent: 5502232 (1996-03-01), Buysch et al.

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