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. 19, 2015
Filed:
Aug. 08, 2014
Joerg-joachim Nitz, Essen, DE;
Stephan Kohlstruk, Duelmen, DE;
Robert Jansen, Bottrop, DE;
Matthias Orschel, Muenster, DE;
Andreas Merkel, Recklinghausen, DE;
Michael Demming, Duelmen, DE;
Matthias Mendorf, Dortmund, DE;
Jens Doering, Dortmund, DE;
Axel Hengstermann, Senden, DE;
Andreas Hoff, Eslohe, DE;
Anja Mueller, Dortmund, DE;
Joerg-Joachim Nitz, Essen, DE;
Stephan Kohlstruk, Duelmen, DE;
Robert Jansen, Bottrop, DE;
Matthias Orschel, Muenster, DE;
Andreas Merkel, Recklinghausen, DE;
Michael Demming, Duelmen, DE;
Matthias Mendorf, Dortmund, DE;
Jens Doering, Dortmund, DE;
Axel Hengstermann, Senden, DE;
Andreas Hoff, Eslohe, DE;
Anja Mueller, Dortmund, DE;
Evonik Industries AG, Essen, DE;
Abstract
A process for preparing isophorone (3,5,5-trimethyl-2-cyclohexen-1-one) is provided wherein distillation vapors from the work-up of product fractions are recycled to earlier stages of operation of the process.