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    • 8. 发明申请
    • SELECTIVE DIMETHYLETHER RECOVERY AND RECYCLE IN A METHANOL-TO-OLEFIN PROCESS
    • 甲醇到烯烃过程中的选择性二甲基甲烷回收和回收
    • WO2004094355A3
    • 2004-12-23
    • PCT/US2004012415
    • 2004-04-22
    • UOP LLCSENETAR JOHN J
    • SENETAR JOHN J
    • C07C41/34C07C43/04C07C41/42
    • C07C41/34Y02P30/42C07C43/043
    • An improved methanol-to-olefin (MTO) product recovery scheme is provided which enables substantial reduction in the amount of light olefins that are undesirably captured in a dimethylether (DME) recycle stream when a portion of the methanolic feed to the MTO reaction zone is used as the scrubbing solvent in a primary DME absorption zone in order to recycle this DME oxygenate by-product to the MTO reaction zone. In accordance with the present invention, a liquid solvent stream recovered from the primary DME absorption zone is subjected in a stripping zone to light olefin stripping conditions sufficient to lift a substantial portion of the light olefins that are absorbed in the DME solvent without stripping a significant portion of this methanol solvent, thereby increasing the recovery of desired light olefins while simultaneously diminishing the amount of light olefins carried by the DME recycle stream back to MTO conversion step.
    • 提供了一种改进的甲醇 - 烯烃(MTO)产物回收方案,当一部分到MTO反应区的甲醇进料的一部分是在二甲醚(DME)循环流中时,能够显着减少在二甲醚(DME)再循环流中不期望地捕获的轻质烯烃的量 用作初级DME吸收区中的洗涤溶剂,以便将该DME含氧化合物副产物再循环到MT​​O反应区。 根据本发明,从初级DME吸收区回收的液体溶剂流在汽提区进行轻质烯烃汽提条件,足以提升大部分在DME溶剂中吸收的轻质烯烃,而不剥离显着的 部分该甲醇溶剂,从而增加所需轻质烯烃的回收率,同时将由DME再循环流携带的轻质烯烃的量减少回MTO转化步骤。