| 摘要 |
PURPOSE:To produce isoamylene efficiently at a low cost, by contacting unreacted hydrocarbon mixture recovered from the production process of polyisoprene with hydrogen in the presence of a catalyst, thereby selectively hydrogenating isoprene in the above mixture to isoamylene. CONSTITUTION:Isoamylene useful as a comonomer of petroleum resin, etc. is produced economically on an industrial scale, effectively utilizing the unreacted hydrocarbon mixture recovered from the polyisoprene production process, by the following steps comprising (I) the polymerization step to polymerize 1 isoprene 10 containing a small amount of isoamylene to produce polyisoprene, (II) the recovery step to recover 3 the hydrocarbon mixture 16 composed mainly of isoamylene and the unreacted isoprene from the step I, (III) the hydrogenation step to contact the hydrocarbon mixture 16 with hydrogen in the presence of a catalyst, and effect the selective hydrogenation 5 of isoprene in the hydrocarbon mixture 16 to isoamylene, and (IV) the separation step to separate 6 the isoamylene 20 from the product 18 of the step III. |
