Method for producing bisphenols

Details Method for producing bisphenols Method for producing bisphenols

2005-02-22

2005-02-22

Shippen, Michael L. (Department: 1621)

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

Organic compounds

Oxygen containing

C568S727000

Reexamination Certificate

active

06858758

ABSTRACT:
A method for producing a bisphenol is disclosed. The method entails reacting in at least one first reactant selected from a first group consisting of phenol and substituted phenols with at least one second reactant selected from a second group consisting of ketones and diols, in the presence of hydrogen chloride catalyst and volatile sulphur compound having an SH bond as co-catalyst. The reaction product is a mixture that contains bisphenol, first reactant and second reactant. The catalyst and co-catalyst and water of reaction are separated by distillation. The method is characterized by the high reaction rates and selectivities.

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patent: 2359242 (1944-09-01), Perkins
patent: 2730552 (1956-01-01), Williamson
patent: 2730553 (1956-01-01), Williamson
patent: 2775620 (1956-12-01), Williamson
patent: 5210328 (1993-05-01), Freitag et al.
patent: 5336812 (1994-08-01), Salek et al.
patent: 6284931 (2001-09-01), Isota et al.

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