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    • 5. 发明公开
    • MULTISTAGE PROCESS FOR THE POLYMERIZATION OF OLEFINS
    • 维生素VERFAHREN ZUR POLYMERISIERUNG VON OLEFINEN
    • EP2788393A2
    • 2014-10-15
    • EP12797880.7
    • 2012-12-04
    • Basell Polyolefine GmbH
    • COVEZZI, MassimoPENZO, GiuseppeMEI, GabrieleMEI, GiuliaBAITA, PietroMEIER, GerhardusDE LUCIA, AntonioSCHUELLER, UlfFERRARO, Gianpiero
    • C08F10/00C08F2/34C08F2/00
    • C08F110/02C08F2/001C08F2/34C08F10/00C08F10/02C08F2500/12C08F2500/18C08F2500/24C08F2/00C08F2/01
    • Process for transferring polyolefin particles from a first gas-phase polymerization reactor to a second gas-phase polymerization reactor in a multistage polymerization of olefins carried out in at least two serially connected gas-phase polymerization reactors, wherein the first gas-phase reactor is a fluidized-bed reactor comprising a gas distribution grid and a settling pipe, which is integrated with its upper opening into the distribution grid and contains a bed of polyolefin particles which moves from top to bottom of the settling pipe, the process comprising the steps of introducing a fluid into the settling pipe in an amount that an upward stream of the fluid is induced in the bed of polyolefin particles above the fluid introduction point; withdrawing polyolefin particles from the lower end of the settling pipe; and transferring the withdrawn polyolefin particles into the second gas-phase polymerization reactor, process for polymerizing olefins comprising such a process for transferring polyolefin particles, reactor suitable as first gas-phase polymerization reactor in the process for polymerizing olefins and process for discharging polyolefin particles from a fluidized-bed reactor.
    • 在至少两个串联连接的气相聚合反应器中进行的在烯烃多级聚合中将聚烯烃颗粒从第一气相聚合反应器转移到第二气相聚合反应器的方法,其中第一气相反应器是 流化床反应器包括气体分配网格和沉降管,其与其上部开口集成到分配网格中并且包含从沉降管的顶部到底部移动的聚烯烃颗粒床,该方法包括以下步骤:引入 流入沉降管中的流体,其量为在流体引入点上方的聚烯烃颗粒床中引起流体的向上流动; 从沉降管的下端抽出聚烯烃颗粒; 并将取出的聚烯烃颗粒转移到第二气相聚合反应器中,用于聚合烯烃的方法包括这种转移聚烯烃颗粒的方法,在聚合烯烃的方法中适合作为第一气相聚合反应器的反应器和用于将聚烯烃颗粒排出的方法 流化床反应器。