Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2005-03-29
2005-03-29
Shipen, Michael L. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S723000, C568S727000, C502S027000, C502S029000, C502S033000
Reexamination Certificate
active
06872859
ABSTRACT:
The present invention relates to a process for preparing bisphenols which comprises reacting a carbonyl compound containing at least two carbon atoms with an aromatic compound, containing a hydroxyl group and at least one hydrogen atom bound to the aromatic ring, in the presence of a catalyst comprising a zeolite characterized by a spaciousness index equal to or higher than 8. The invention also relates to a method for the regeneration of the zeolitic catalyst used in this process and comprises subjecting the exhausted catalyst to hot treatment with a suitable aromatic compound containing at least one activating group, preferably the same hydroxylated aromatic compound used in the process for the preparation of bisphenols from which the exhausted catalyst derives.
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De Angelis Alberto
Perego Carlo
Enitecnologie S.p.A.
Shipen Michael L.
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