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:
Jun. 11, 2019
Filed:
Oct. 27, 2015
Basf SE, Ludwigshafen, DE;
Dow Global Technologies Llc, Midland, MI (US);
Joaquim Henrique Teles, Waldsee, DE;
Dominic Riedel, Lampertheim, DE;
Bianca Seelig, Milan, IT;
Philip Kampe, Bensheim, DE;
Markus Weber, Limburgerhof, DE;
Alexander Schroeder, Wattenheim, DE;
Andrei-Nicolae Parvulescu, Ruppertsberg, DE;
Ulrich Mueller, Neustadt, DE;
Daniel Urbanczyk, Griesheim, DE;
Meinolf Weidenbach, Stade, DE;
Werner J. Witzl, Stade, DE;
Holger Baer, Stade, DE;
BASF SE, Ludwigshafen, DE;
DOW GLOBAL TECHNOLOGIES LLC, Midland, MI (US);
Abstract
A continuous process for preparing propylene oxide proceeds by (a) reacting propene with hydrogen peroxide in a reaction apparatus in the presence acetonitrile as solvent, obtaining a stream S0 containing propylene oxide, acetonitrile, water, at least one further component B; (b) separating propylene oxide from S0, obtaining stream S1 containing acetonitrile, water and B; (c) dividing S1 into streams S2 and S3; (d) subjects S3 to vapor-liquid fractionation in a first fractionation unit, obtaining vapor fraction stream S4a being depleted, relative to S3, of at least one of B and obtaining liquid bottoms stream S4b, and subjecting at least part of vapor fraction stream S4a to vapor-liquid fractionation in a second fractionation unit, obtaining vapor fraction stream S4c and liquid bottoms stream S4 being depleted, relative to S4a, of at least one of B; (e) recycling at least a portion of S4 to (a).