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. 25, 2016
Filed:
Nov. 19, 2013
Bayer Materialscience Ag, Leverkusen, DE;
Pieter Ooms, Krefeld, DE;
Friedhelm Risse, Köln, DE;
Andre Düx, Bornheim, DE;
Carsten Buchaly, Düsseldorf, DE;
Thomas Pancur, Altenholz, DE;
Arthur Susanto, Köln, DE;
Georg Ronge, Singapore, MY;
Johan Vanden Eynde, Zwijnaarde, BE;
Wim Wuytack, Zele, BE;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
The present invention relates to a continuous process for producing lower dialkyl carbonates as a main product and alkylene glycol as a by-product by transesterification of a cyclic alkylene carbonate (e.g. ethylene or propylene carbonate) with lower alkyl alcohols in the presence of a catalyst and also the necessary purification of the dialkyl carbonate in a subsequent process step. For optimization of the economic efficiency and energy efficiency of the process, additional devices are used for intermediate heating of the internal liquid streams within the apparatus.