Production of isoprene from isobutane

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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260683D, 2606832, C07C 1112

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active

040910466

ABSTRACT:
Isoamylene is produced from isobutane by cracking isobutane, separating a propylene stream and an isobutylene stream from the cracked product, disproportionating the propylene and isobutylene and separating an isoamylene stream from the disproportionated stream. The isoamylene can be converted into isoprene by dehydrogenation. The isobutane can be produced from normal butane by skeletal isomerization. The ethylene produced during the disproportionation can be dimerized and the butylenes obtained can be either reintroduced into the disproportionation reaction or can be dehydrogenated to butadiene. Isobutane removed from the cracked product, as well as isobutane removed from the disproportionated stream, is recycled into the cracking reaction. Hydrogen produced during the cracking reaction can be used either in the isomerization step for converting normal butane to isobutane, or can be used for hydrogenation of acetylenes produced during the conversion of the normal butene to butadiene.

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