The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 2005
Filed:
May. 28, 2002
Carlo Perego, Carnate-Milan, IT;
Alberto DE Angelis, Legnano-Milan, IT;
Carlo Perego, Carnate-Milan, IT;
Alberto De Angelis, Legnano-Milan, IT;
Enitecnologie S.p.A., San Donato Milanese, IT;
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.