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:
Oct. 08, 2013
Filed:
Feb. 01, 2011
Pieter Ooms, Krefeld, DE;
Friedhelm Risse, Köln, DE;
Andre Düx, Brühl, DE;
Carsten Buchaly, Düsseldorf, DE;
Thomas Pancur, Altenholz, DE;
Arthur Susanto, Köln, DE;
Georg Ronge, Düsseldorf, DE;
Johan Vanden Eynde, Zwijnaarde, BE;
Wim Wuytack, Zele, BE;
Pieter Ooms, Krefeld, DE;
Friedhelm Risse, Köln, DE;
Andre Düx, Brühl, DE;
Carsten Buchaly, Düsseldorf, DE;
Thomas Pancur, Altenholz, DE;
Arthur Susanto, Köln, DE;
Georg Ronge, Düsseldorf, DE;
Johan Vanden Eynde, Zwijnaarde, BE;
Wim Wuytack, Zele, BE;
Bayer MaterialScience AG, , DE;
Abstract
The present invention relates to a continuous process for preparing lower dialkyl carbonates as main product and alkylene glycol as by-product by transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with lower alkyl alcohols in the presence of a catalyst and also the required purification of the dialkyl carbonate in a subsequent process step. To optimize the economics and energy efficiency of the process, additional devices are used for intermediate heating of the liquid streams in the apparatus.