US 12,006,285 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 Mar. 2, 2023, as Appl. No. 18/116,336.
Application 18/116,336 is a continuation of application No. 17/265,472, granted, now 11,649,197, 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 2023/0202948 A1, Jun. 29, 2023
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)] 4 Claims
OG exemplary drawing
 
1. A processing facility for the purification of isobutene from a C4 stream which contains at least 1-butene, 2-butene, isobutane and isobutene, comprising the following equipment:
an isomerization reactor which comprises a catalyst which comprises at least one metal which is active in hydrogenation on a support, wherein the catalyst is configured to isomerize 1-butene to 2-butene;
a rectification column which is connected downstream of the isomerization reactor, wherein the rectification column is configured to produce a stream concentrated in isobutene;
a further rectification column configured to receive the C4 stream and to produce a stream concentrated in 2-butene from a bottom of the further rectification column and a stream concentrated in isobutane and isobutene from a head of the further rectification column;
a further catalyst that comprises at least one metal which is active in hydrogenation on a support, wherein the further rectification column is connected to the further catalyst at a point below the head and above the bottom of the further rectification column, wherein the further catalyst is configured to isomerize 1-butene to 2-butene, and wherein the isomerization reactor is downstream of the head of the further rectification column;
a heat exchanger configured to provide heat to the rectification column; and
a line which is connected to the head of the further rectification column and to the heat exchanger for heat transfer between the rectification column and the further rectification column.