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:
Jan. 30, 2007
Filed:
Nov. 26, 2003
Thomas Haas, Frankfurt, DE;
Willi Hofen, Rodenbach, DE;
Wolfgang Wöll, Maintal, DE;
Claudia Brasse, Hanau, DE;
Guido Stochniol, Gelnhausen, DE;
Norbert Ullrich, Essen, DE;
Thomas Haas, Frankfurt, DE;
Willi Hofen, Rodenbach, DE;
Wolfgang Wöll, Maintal, DE;
Claudia Brasse, Hanau, DE;
Guido Stochniol, Gelnhausen, DE;
Norbert Ullrich, Essen, DE;
Degussa AG, Düsseldorf, DE;
Uhde GmbH, Dortmund, DE;
Abstract
A process for the catalytic epoxidation of olefins in the presence of a titanium containing zeolite catalyst and a polar solvent whereby the deactivation of the catalyst upon recycling of the solvent has been considerably reduced. In the process one or more nitrogen containing compounds are introduced at some stage, a solvent stream is recovered, treated to contain less than 50 wppm nitrogen in the form of organic nitrogen compounds and at least a part of it is recycled to the epoxidation step. Also disclosed is a process for the catalytic epoxidation of propene which integrates the treatment and recycle of the solvent into the workup of the reaction mixture.