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 |
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.
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