Process for recovering olefins in polyolefin plants
    4.
    发明授权
    Process for recovering olefins in polyolefin plants 有权
    在聚烯烃工厂中回收烯烃的方法

    公开(公告)号:US09073808B1

    公开(公告)日:2015-07-07

    申请号:US14486382

    申请日:2014-09-15

    IPC分类号: C07C7/144 C07C7/09 C07C7/00

    摘要: A process for recovering unreacted olefin in a polyolefin manufacturing process comprising the treatment of a purge bin vent gas. The process involves cooling and condensing the vent gas (purge stream), which contains at least an olefin, a paraffin, and nitrogen, to produce a liquid condensate and an uncondensed (residual) gas stream. Both streams are then passed through membrane separation steps. The membrane separation of the uncondensed gas stream results in a residue stream containing mostly nitrogen and/or paraffin and a permeate stream enriched in either C2+ hydrocarbons or olefin, depending on the type of separation. The permeate from this step is recirculated within the process prior to the condensation step. The membrane separation of the condensate results in a residue stream containing paraffin and a permeate stream enriched in olefin, which may be recycled to the polymerization reactor.

    摘要翻译: 一种在聚烯烃制造方法中回收未反应烯烃的方法,包括处理净化箱排气。 该方法包括冷却和冷凝含有至少一种烯烃,石蜡和氮气的排出气体(吹扫流),以产生液体冷凝物和未冷凝(残余)气流。 然后将两个流通过膜分离步骤。 未冷凝的气流的膜分离导致根据分离类型,主要含有氮和/或石蜡的残留物流和富含C 2 +烃或烯烃的渗透物流。 来自该步骤的渗透物在冷凝步骤之前在该过程中再循环。 冷凝物的膜分离产生含有石蜡和富含烯烃的渗透物流的残余物流,其可循环至聚合反应器。