Patent ID: 6916448
Filing Date: 2005-07-12
Classification: C07C

Abstract:
1. An apparatus for the conversion of an olefinic C 4 fraction into isobutene and into propylene, successively comprising: 1) a selective hydrogenation zone with isomerization of butene-1 into butene-2, whereby said zone comprises at least one means ( 2) a separation that comprises at least one means ( 4) a metathesis zone that contains at least one catalyst bed and that comprises at least one means ( whereby said apparatus also comprises a skeletal-isomerization zone ( 3 ) that comprises at least one means ( 9 ) for introducing the output of isobutane and butene-1 obtained from zone ( 2 ), at least one means ( 10 ) for recycling from the outlet of zone ( 3 ) to the inlet of zone ( 1 ) and at least one means ( 13 ) for purging the optionally present isobutane, whereby said skeletal-isomerization zone ( 3 ) also comprises at least one catalyst bed.