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:
Aug. 04, 1992
Filed:
May. 29, 1991
Applicant:
Inventors:
August Van Gysel, Dilbeek, BE;
Ivan Vanden Eynde, Keerbergen, BE;
Jean-Claude Vanovervelt, Warchin, BE;
Assignee:
U C B, S.A., Brussels, BE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
548549 ; 548548 ; 203 14 ; 203 58 ;
Abstract
A process for the manufacture of N-phenylmaleimide which comprises reacting maleic anhydride with aniline in a single step at elevated temperature in the presence of a water-immiscible organic solvent capable of forming an azeotrope with water and of p-toluenesulfonic acis as catalyst. According to the invention, N-phenylmaleimide recovery comprises the successive steps of: