Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2007-09-26
2009-02-03
Witherspoon, Sikarl A (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S768000, C568S798000
Reexamination Certificate
active
07485758
ABSTRACT:
A method for the production of phenol and acetone from a cumene hydroperoxide mixture comprises a first stage and a second stage and at least two serially connected reactors, wherein the first stage comprises decomposition of a cumene hydroperoxide mixture in the presence of a catalyst mixture to form a dicumyl peroxide mixture, and the second stage comprises formation of a phenol and acetone mixture from decomposition of the dicumyl peroxide mixture formed in the first stage, wherein, the first stage further comprises: a) forming a catalyst mixture by combining sulfuric acid and phenol in a weight ratio of from 2:1 to 1:1000 in a catalyst formation reactor, b) holding the catalyst mixture in the catalyst formation reactor at a temperature of about 20 to 80° C. for about 1 to 600 minutes; and, c) adding the catalyst mixture to the cumene hydroperoxide mixture to form the phenol and acetone mixture. The proposed method permits a significant reduction in the yield of hydroxyacetone that causes deterioration in the quality of commercial phenol.
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Dyckman Arkady Samuilovich
Grebenshchikov Ilya Nikolaevich
Nelson Mark
Pinson Viktor Vladimirovich
Sederel Willem Lodewyk
SABIC Innovative Plastics IP B.V.
Witherspoon Sikarl A
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