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US 5,231,210 AGranted
Method for making aromatic carbonates
AssigneeGeneral Electric Company
InventorsRichard P. Joyce, Joseph A. King, Jr., Eric J. Pressman
Life of this patent
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Abstract
A method is provided for making diphenyl carbonate by the direct carbonylation of phenol utilizing a palladium catalyst in combination with an inorganic cocatalyst in the form of a cobalt pentadentate complex.
Claims4
A method for making aromatic organic carbonate comprising heating to a temperature of about 60.degree. C. to about 150.degree. C. a mixture comprising aromatic organic hydroxy compound, carbon monoxide, oxygen, and an effective amount of a palladium carbonylation catalyst comprising,
- (a) catalytically active palladium in the metallic or chemically combined state,
- (b) an inorganic cocatalyst in the form of a cobalt complex of a cobalt (II) salt and a Schiff base, and
- (c) a quaternary ammonium or phosphonium halide.
Dependencies are inferred from the claim text.