Process for the production of diaryl carbonates
AssigneeGeneral Electric Company
InventorEric James Pressman
Life of this patent
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Abstract
The method of the present invention comprises reaction of a gaseous mixture of oxygen and carbon monoxide with an aromatic hydroxy compound in the presence of a catalyst under controlled pressure, wherein the partial pressure of oxygen is optimized to effect increased yields at reduced overall pressure.
Claims17
A method for the production of diaryl carbonates, said method comprising reacting an aromatic hydroxy compound, in the presence of an effective amount of a catalyst system comprising:
- at least one palladium source, and
- at least one inorganic co-catalyst which is a cobalt(II) halide or carboxylate salt or amine, diketone or carbon monoxide complex or a cobalt(II) salt complexed with a pentadentate ligand selected from the group consisting of aromatic amines, aliphatic amines, aromatic ethers and Schiff bases;
- with a gas mixture comprising carbon monoxide and oxygen under an applied total pressure, wherein the mole percentage of oxygen in said gas mixture is as follows:
- between about 8 and about 10 mole percent at a total pressure less than or equal to about 500 pounds per square inch,
- between about 6 and about 12 mole percent at a total pressure above about 500 and less than or equal to about 800 pounds per square inch, or
- between about 7 and about 10 mole percent at a total pressure above about 800 and less than or equal to about 1600 pounds per square inch.
A method for the production of diaryl carbonates, said method comprising reacting an aromatic hydroxy compound, in the presence of an effective amount of a catalyst system comprising at least one palladium source and cobalt di-(salicylal)-3,3′-diamino-N-methyldipropylamine, with a gas mixture consisting essentially of carbon monoxide and oxygen under an applied total pressure, wherein the mole percentage of oxygen in said gas mixture is as follows:
- about 9-10 mole percent at a total pressure less than or equal to 500 pounds per square inch,
- about 6-10 mole percent at a total pressure above 500 and less than or equal to 800 pounds per square inch, and
- about 7.5-8 mole percent at a total pressure above 800 and less than or equal to 1600 pounds per square inch.
Dependencies are inferred from the claim text.