Method for making aromatic carbonates

A technology of diaryl carbonate and aromatic hydroxy, which is applied in the field of carbonylation of aromatic hydroxy compounds, and can solve problems such as low commercial purpose and low reaction rate
CN1332718AInactive Publication Date: 2002-01-23GENERAL ELECTRIC CO
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GENERAL ELECTRIC CO
Publication Date
2002-01-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to an improved process for the production of aromatic carbonates by reacting aromatic hydroxyl compounds, carbon monoxide and oxygen in the presence of a catalyst system comprising at least one palladium or palladium compound, at least one lead compound, at least one halide Source and at least one desiccant, wherein the optimum ratio of lead co-catalyst to palladium catalyst equivalents can increase the reaction rate and also make aromatic carbonates available in an economically viable continuous process.
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Description

Background of the invention

[0001] The present invention relates to the preparation of aromatic carbonates by carbonylation of organic aromatic hydroxyl compounds, such as phenol, in the presence of catalysts. In particular, this invention relates to an improved process for the carbonylation of aromatic hydroxy compounds with a mixture of carbon monoxide and oxygen in the presence of palladium-containing catalysts and lead-containing cocatalysts.

[0002] Aromatic carbonates, such as diaryl carbonates, are valuable intermediates for the preparation of polycarbonates by the transesterification of bisphenols in the molten state. The polycarbonate preparation method has environmental advantages over other methods which use phosgene, a poisonous gas, as a reagent and environmentally harmful chlorinated aliphatic hydrocarbons such as dichloromethane as a solvent. This preparation requires large amounts of diaryl carbonates.

[0003] Various methods have been disclosed for the car...

Claims

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