Bisphenol-A plant yield enhancement

Details Bisphenol-A plant yield enhancement Bisphenol-A plant yield enhancement

2006-08-24

2011-10-18

Keys, Rosalynd (Department: 1621)

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

Organic compounds

Oxygen containing

C568S724000, C568S728000

Reexamination Certificate

active

08039679

ABSTRACT:
An improved process is provided for producing bisphenol-A (BPA) comprising steps of (1) contacting benzene and a C3alkylating agent to produce an alkylation effluent comprising cumene; (2) oxidizing the cumene to produce the corresponding hydroperoxide; (3) cleaving the hydroperoxide to produce product comprising phenol and acetone; (4) reacting acetone with phenol to form a reaction product stream comprising crude bisphenol-A product; (5) distilling the reaction product stream, while sending downstream to a BPA-phenol adduct crystallization and purification step, the resulting concentrated BPA phenolic feed stream; (6) producing BPA-phenol adduct crystals by crystallization of the concentrated BPA phenolic feed stream; (7) separating the BPA-phenol adduct crystals by solid-liquid separationr; (8) cracking a stream comprising at least a portion of said final mother liquor to recover a product; and (9) recovering and feeding the phenol product of step (8) to step (4) and/or step (7).

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Office Action issued on Aug. 26, 2010 in the corresponding Chinese Application No. 200680037195.0.

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