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:
Nov. 17, 2015
Filed:
Sep. 18, 2011
Maria Guixa Guardia, Mannheim, DE;
Rolf Pinkos, Bad Duerkheim, DE;
Nadja Pollmer, Bissersheim, DE;
Wolf-steffen Weissker, Lambsheim, DE;
Hugues Vandenmersch, Jardine's Lookout, HK;
Maria Guixa Guardia, Mannheim, DE;
Rolf Pinkos, Bad Duerkheim, DE;
Nadja Pollmer, Bissersheim, DE;
Wolf-Steffen Weissker, Lambsheim, DE;
Hugues Vandenmersch, Jardine's Lookout, HK;
BASF SE, Ludwigshafen, DE;
Abstract
A process which isolates tetrahydrofuran from a stream of tetrahydrofuran, alkanol and high boilers, by: (a) separating off a first stream of tetrahydrofuran and alkanol as azeotrope in a first distillation stage; (b) feeding part of the first stream into a reactor for esterifying maleic anhydride, giving a second stream of tetrahydrofuran and monoalkyl maleate; (c) separating the second stream into a third stream of monoalkyl maleate and a fourth stream of tetrahydrofuran in a second distillation stage; (d) feeding the fourth stream of tetrahydrofuran from the second distillation stage and the part of the first stream from (a) which is not fed to the reactor into a third distillation stage to obtain a product stream of tetrahydrofuran and a sixth stream of tetrahydrofuran and alkanol; (e) recirculating the sixth stream from the third distillation stage into the first distillation stage or the reactor in (b).