Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1999-04-08
2000-11-14
Shippen, Michael L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C07C 3916
Patent
active
061472646
ABSTRACT:
Bisphenol-A or preferably, a mixture of bisphenol-A and underbrominated bisphenol-A, is brominated in a liquid phase reaction medium in which tetrabromobisphenol-A is relatively insoluble, using a stoichiometric deficiency of bromine to thereby form in the reaction mass a precipitate (i.e., a solids phase) composed of 50-95 wt % of tetrabromobisphenol-A and 50-5 wt % of underbrominated bisphenol-A. The precipitate is separated from the reaction mass, preferably during the bromination, and tetrabromobisphenol-A is recovered from the precipitate. Preferably underbrominated bisphenol-A is recycled as feed to the bromination. The process technology of this invention has the capability of producing high quality tetrabromobisphenol-A (high purity, good color, low ionic halide content) with efficient raw material utilization, minimized waste product formation, and minimized waste disposal costs.
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Barton Randall S.
Holub Richard A.
Manimaran Thanikavelu
Albemarle Corporation
Shippen Michael L.
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