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. 26, 2015
Filed:
Jun. 12, 2009
Andre Düx, Brühl, DE;
Guenter Olf, Leverkusen, DE;
Kaspar Hallenberger, Leverkusen, DE;
Georg Ronge, Düsseldorf, DE;
Ricarda Leiberich, Neu-Isenburg, DE;
Johan Vanden Eynde, Zwijnaarde, BE;
Wim Wuytack, Zele, BE;
Pieter Ooms, Krefeld, DE;
Johann Rechner, Kempen, DE;
Andre Düx, Brühl, DE;
Guenter Olf, Leverkusen, DE;
Kaspar Hallenberger, Leverkusen, DE;
Georg Ronge, Düsseldorf, DE;
Ricarda Leiberich, Neu-Isenburg, DE;
Johan Vanden Eynde, Zwijnaarde, BE;
Wim Wuytack, Zele, BE;
Pieter Ooms, Krefeld, DE;
Johann Rechner, Kempen, DE;
Bayer MaterialScience AG, , DE;
Abstract
The invention provides a process for preparing diaryl carbonates from dialkyl carbonates and aromatic hydroxyl compounds using at least two reaction columns, a process section for recovering the dialkyl carbonate used in the reaction and for removing the alcohol of reaction, one or more process steps for removing the by-products obtained in the process which have a boiling point between that of the dialkyl carbonate and that of the alkyl aryl carbonate formed during the preparation of the diaryl carbonate, and a process step for further purification of the diaryl carbonate obtained from the reaction columns.