Isoprene polymerization
    5.
    发明授权
    Isoprene polymerization 失效
    异丙酚聚合

    公开(公告)号:US3583966A

    公开(公告)日:1971-06-08

    申请号:US3583966D

    申请日:1969-01-06

    Inventor: DAVISON JOSEPH W

    CPC classification number: C08F136/08 C08F4/484

    Abstract: ISOAMYLENES ARE PASSED THROUGH A DEHYDROGENATION REACTOR AND THE RESULTING MIXTURE OF ISOPRENE AND ISOAMYLENES PASSED TO EXTRACTIVE DISTILLATION FOR REMOVAL OF ACETYLENES, CYCLOPENTADIENE, PIPERYLENES, AND OTHER ISOPRENE POLYMERIZATION CATALYST POISONS. THE POISON-FREE OVERHEAD FROM THE EXTRACTIVE DISTILLATION UNIT IS PASSED TO A POLYMERIZATION REACTOR FOR PRODUCTION OF CIS-POLYISOPRENE. ISOAMYLENES TOGETHER WITH UNREACTED ISOPRENE ARE RECOVERED FROM THE POLYMERIZATION EFFLUENT AND PASSED TO A LIQUIDLIQUID EXTRACTOR FROM WHICH THE RAFFINATE CONTAINING ISOAMYLENES IS RECYCLED TO DEHYDROGENATION AND THE RICH SOLVENT CONTAINING ISOPRENE IS PASSED AS THE ONLY SOLVENT TO THE EXTRACTIVE DISTILLATION UNIT. RICH SOLVENT FROM THE LATTER IS STRIPPED TO REJECT CATALYST POISONS AND THE LEAN SOLVENT PASSED TO THE EXTRACTOR. THE EXTRACTIVE DISTILLATION AND LIQUID EXTRACTION STEPS ARE THUS MADE MORE ECONOMICAL BY USING THE SAME SOLVENT IN BOTH AND BY ABSORBING ONLY THE MINOR COMPONENTS IN THE SOLVENT.

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