US 12,435,017 B2
Method for purifying isobutene from a C4 stream and process system therefor
Suman Thotla, Mannheim (DE); Pawel Tadeusz Czajka, Mannheim (DE); Stefan Manfred Iselborn, Frankenthal (DE); Kai-Uwe Wemhöner, Vienna (AT); and Jürgen Popp, Vienna (AT)
Assigned to OMV DOWNSTREAM GMBH, Vienna (AT); and BASF SE, Ludwigshafen (DE)
Filed by OMV Downstream GmbH, Vienna (AT); and BASF SE, Ludwigshafen (DE)
Filed on May 7, 2024, as Appl. No. 18/656,750.
Application 18/656,750 is a continuation of application No. 18/116,336, filed on Mar. 2, 2023, granted, now 12,006,285.
Application 18/116,336 is a continuation of application No. 17/265,472, granted, now 11,649,197, issued on May 16, 2023, previously published as PCT/EP2019/070859, filed on Aug. 2, 2019.
Claims priority of application No. 18187133 (EP), filed on Aug. 2, 2018.
Prior Publication US 2024/0286978 A1, Aug. 29, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 5/25 (2006.01); B01D 3/00 (2006.01); B01D 3/14 (2006.01); B01J 21/04 (2006.01); B01J 23/42 (2006.01); B01J 23/44 (2006.01); C07C 7/00 (2006.01); C07C 7/04 (2006.01)
CPC C07C 5/2556 (2013.01) [B01D 3/007 (2013.01); B01D 3/143 (2013.01); B01J 21/04 (2013.01); B01J 23/42 (2013.01); B01J 23/44 (2013.01); C07C 7/005 (2013.01); C07C 7/04 (2013.01); C07C 2521/04 (2013.01); C07C 2523/42 (2013.01); C07C 2523/44 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A process for the purification of isobutene from a C4 stream which comprises at least 1-butene, 2-butene, isobutane and isobutene, comprising the following steps:
obtaining a stream of material concentrated in isobutane and isobutene from the C4 stream;
supplying the stream of material which is concentrated in isobutane and isobutene and a stream of hydrogen to an isomerization reactor, wherein the isomerization reactor comprises a catalyst which comprises at least one metal which is active in hydrogenation on a first support;
bringing the stream of material which is concentrated in isobutane and isobutene and the stream of hydrogen into contact with the catalyst in the isomerization reactor, whereupon 1-butene present in the stream of material which is concentrated in isobutane and isobutene is isomerized to 2-butene;
obtaining a product stream from the isomerization reactor, wherein the product stream comprises less 1-butene in relation to the stream of material which is concentrated in isobutane and isobutene;
supplying the product stream to a rectification column to separate a stream of material which is concentrated in isobutene via a side stream and a stream of material which is concentrated in isobutane as an overhead product, wherein a percentage of total separation stages of the rectification column is below the separation stage in which the side stream is located.