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US 5,856,554 AGranted
Process for producing diaryl carbonates
AssigneeBayer Aktiengesellschaft
InventorsHans-Josef Buysch, Carsten Hesse, Johann Rechner
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Abstract
The present invention relates to a process for producing diaryl carbonates by the reaction of an aromatic hydroxy compound (e.g. phenol) with carbon monoxide and oxygen in the presence of a catalyst, a co-catalyst, a quaternary salt and a base, which is characterised in that the reaction is conducted in a melt comprising the diaryl carbonate and the hydroxy compound on which the carbonate is based, and further diaryl carbonate is optionally added to this reaction mixture before work-up.
Claims8
A process for producing diaryl carbonate of the formula
- R--O--CO--O--R (I)
- wherein
- R represents a substituted or unsubstituted C.sub.6 -C.sub.12 aryl which comprises reacting an aromatic hydroxy compound of the formula
- R--O--H (II)
- wherein
- R has the meaning given above,
- with carbon monoxide and oxygen in the presence of a platinum metal catalyst, a co-catalyst, a quaternary salt and a base at a temperature of 30.degree. to 200.degree. C. and at a pressure of 1 to 200 bar, wherein the reaction is conducted in a melt comprising said diaryl carbonate and said aromatic hydroxy compound, which at the start of the reaction is provided with a content of said diaryl carbonate of at least 20% by weight,
- and isolating diaryl carbonate from the melt.
5 more elements
Dependencies are inferred from the claim text.