Distillation: processes – separatory – Plural distillations performed on same material – And returning distillation product to a previous...
Patent
1991-08-29
1993-08-31
Bascomb, Jr., Wilbur
Distillation: processes, separatory
Plural distillations performed on same material
And returning distillation product to a previous...
203 65, 203 78, 203DIG19, 568324, 568335, 568754, B01D 314, C07C 3774
Patent
active
052405680
ABSTRACT:
A process for separating phenol obtained by the decomposition of cumene hydroperoxide from high boiling impurities, includes the following steps:
a) feeding phenol rectification bottoms comprising phenol, acetophenone, cumylphenol, alpha-methylstyrene dimers and high boiler residues to a first phenol freeing distillation column A;
b) feeding concentrated bottoms with substantially reduced phenol content from column A to a second residue concentration distillation column B;
c) withdrawing a stream rich in compounds boiling between phenol and residue, particularly cumylphenol, from said column B from a point below the feed and returning at least a portion of said stream to said column A at a point above the feed;
d) recovering overheads from column A comprising at least 95 weight percent phenol; and
e) recovering acetophenone-rich overheads from column B comprising at least 70 weight percent acetophenone.
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Chemical Abstracts, vol. 83 No. 21 Nov. 24, 1975 Columbus, Ohio, U.S.; Abstract No. 178548m.
Balint, deceased Laszlo J.
Chan Chong H.
Crescentini Lamberto
Hinton, Jr. Everett H.
Allied-Signal Inc.
Bascomb, Jr. Wilbur
Thrower William H.
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