Process for the preparation of diaryl carbonate

Details Process for the preparation of diaryl carbonate Process for the preparation of diaryl carbonate

2008-01-21

2010-06-08

Shiao, Rei-tsang (Department: 1628)

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

Organic compounds

Carbonate esters

Reexamination Certificate

active

07732629

ABSTRACT:
The invention relates to a process for the preparation of a diaryl carbonate by transesterification of an aromatic alcohol with a dialkyl carbonate in the presence of a transesterification catalyst during a period of time [ta],in which the aryl moiety is selected from unsubstituted phenyl and mono-, di- and trisubstituted phenyl groups,in which the alkyl moiety is selected from C2to C4linear and branched alkyl groups,in which the catalyst concentration is designated [ca], expressed as gram catalyst per gram of aromatic alcohol and dialkyl carbonate,in which the period of time [tm] and catalyst concentration [cm] are determined to arrive at a pre-set approach to the equilibrium for the transesterification of the aromatic alcohol with dimethyl carbonate to methyl aryl carbonate and methanol,in which the product [ca]*tais at least 1.5*[cm]*tmunder otherwise the same reaction conditions.

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W B Kim et al., Ind. Eng. Chem. Res., 2004, 43,1897-1914.

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