Method of preparing a purified ester-substituted phenol stream

Details Method of preparing a purified ester-substituted phenol stream Method of preparing a purified ester-substituted phenol stream

2007-11-30

2011-10-11

Sullivan, Daniel (Department: 1621)

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

Organic compounds

Carbonate esters

C558S271000, C560S064000, C560S067000, C560S071000

Reexamination Certificate

active

08034967

ABSTRACT:
A method of producing a purified ester-substituted phenol stream is provided. The method includes a first step of obtaining from a melt transesterification reaction a byproduct stream containing a residual ester-substituted diaryl carbonate, an ester-substituted phenol, a residual melt transesterification catalyst, and a catalyst degradation product. A second step includes treating the reaction byproduct stream to separate ester-substituted phenol and catalyst degradation product from residual ester-substituted diaryl carbonate and residual melt transesterification catalyst to create a light recycle stream containing ester-substituted phenol and catalyst degradation product and a heavy recycle stream containing residual ester-substituted diaryl carbonate and residual melt transesterification catalyst. A third step includes treating the light recycle stream to reduce catalyst degradation product concentration thereby producing a purified ester-substituted phenol stream.

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