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:
May. 23, 2006
Filed:
Nov. 26, 2003
Willi Hofen, Rodonbach, DE;
Thomas Haas, Frankfurt, DE;
Wolfgang Wöll, Maintal, DE;
Georg Thiele, Hanau, DE;
Willi Hofen, Rodonbach, DE;
Thomas Haas, Frankfurt, DE;
Wolfgang Wöll, Maintal, DE;
Georg Thiele, Hanau, DE;
Degussa AG, Duesseldorf, DE;
UHDE GmbH, Dortmund, DE;
Abstract
A process for the purification of a crude propene oxide containing methanol and acetaldehyde by a continuously operated extractive distillation using an extraction solvent lowering the volatility of methanol and feeding a compound containing an unsubstituted NHgroup capable of reacting with acetaldehyde to a distillation column at a point above the feeding point of the crude propene oxide to give a purified propene oxide containing less than 100 ppm methanol and less than 100 ppm acetaldehyde. There is also disclosed a process for the catalytic epoxidation of propene that includes this purification stage.