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:
Dec. 25, 2012
Filed:
Jun. 25, 2010
Friedhelm Risse, Köln, DE;
Pieter Ooms, Krefeld, DE;
Andre Düx, Brühl, DE;
Marcus Grünewald, Dortmund, DE;
Thomas Pancur, Altenholz, DE;
Arthur Susanto, Köln, DE;
Georg Ronge, Düsseldorf, DE;
Johan Vanden Eynde, Zwijnaarde, BE;
Wim Wuytack, Zele, BE;
Friedhelm Risse, Köln, DE;
Pieter Ooms, Krefeld, DE;
Andre Düx, Brühl, DE;
Marcus Grünewald, Dortmund, 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, Leverkusen, 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 catalyzed transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with lower alcohols, where the reaction of the alkylene carbonate is carried out with an alcohol containing dialkyl carbonate in countercurrent, characterized in that introduction of a stream containing at least 99.5% by weight of alcohol takes place below the point of introduction for the alcohol containing dialkyl carbonate in a particular spacing ratio between the abovementioned points of introduction.