Iso-olefin production

Details Iso-olefin production Iso-olefin production

C - Chemistry, Metallurgy

07

C

C07C 11/02 (2006.01) C07C 5/27 (2006.01)

Patent

CA 2112118

2112118 9303118 PCTABS00019 The present invention relates to a process for increasing the selectivity of the production of isobutylene in an admixture of C4 olefins by passing a feed comprising an aliphatic hydrocarbon containing from 5 to 20 carbon atoms in the vapor phase at a temperature up to 621 ·C (1150 ·F) over a first catalyst composition comprising ZSM-5, ZSM-12 or zeolite Y to produce a first composition comprising at least one normal-olefin of at least 4 carbon atoms in a first product stream, and contacting the normal-olefin with a second catalyst composition comprising a zeolite selected from the group consisting of ZSM-22, ZSM-23, ZSM-34, ZSM-35 and ZSM-48 under a second set of conditions which include a temperature within the range of from 371 ·C (700 ·F) to 621 ·C (1150 ·F).

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