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:
Jul. 22, 2014
Filed:
Feb. 28, 2006
Martin Rothaemel, Frankfurt, DE;
Walter Boll, Frankfurt, DE;
Gerhard Birke, Frankfurt, DE;
Harald Koempel, Neu-Isenburg, DE;
Waldemar Liebner, Oberusel, DE;
Hermann Bach, Heiligenroth, DE;
Martin Rothaemel, Frankfurt, DE;
Walter Boll, Frankfurt, DE;
Gerhard Birke, Frankfurt, DE;
Harald Koempel, Neu-Isenburg, DE;
Waldemar Liebner, Oberusel, DE;
Hermann Bach, Heiligenroth, DE;
Lurgi AG, Frankfurt, DE;
Abstract
In a process for the preparation of C- to C-olefins, a feed stream comprising oxygenates and steam is passed through at least one fixed-bed zone comprising zeolite catalyst, where the oxygenates are converted catalytically into olefins with high selectivity for lower olefins, and the reaction mixture leaving the fixed-bed zone is separated into a first product stream comprising C- to C-olefins and inert gas components, at least one second product stream comprising C-olefins, and a third product stream consisting of aqueous phase. In order to improve the yield of lower olefins, the aim is to regulate the temperature of the catalytic reaction in accordance with a target temperature value in the range from 440 to 520° C. specified for the reaction mixture exiting the fixed-bed zone by means of a supplementary stream consisting of olefins and inert gas components fed into the feed stream.