Method for purifying isobutene from a C4 stream and process system therefor
AssigneesOmv Downstream GmbH, BASF SE
InventorsSuman Thotla, Pawel Tadeusz Czajka, Stefan Manfred Iselborn, Kai-Uwe Wemhöner, Jürgen Popp
Life of this patent
Estimating the term…
Abstract
A process for the purification of isobutene from a C4 stream with at least 1-butene, 2-butene, isobutane and isobutene includes isomerizing 1-butene from a stream of material which is concentrated in isobutane and isobutene obtained from the C4 stream into 2-butene, using a catalyst in an isomerization reactor; supplying a product stream from the isomerization reactor to a rectification column; and providing a stream of material which is concentrated in isobutene. A processing facility is utilized for the purification of isobutene from the C4 stream.
Claims22
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.
Dependencies are inferred from the claim text.