公开(公告)号：US10131719B2

公开(公告)日：2018-11-20

申请号：US14651124

申请日：2013-12-11

Applicant: Basell Polyolefine GmbH

Inventor： Giuseppe Penzo ,  Giulia Mei ,  Gabriele Mei ,  Antonio De Lucia ,  Pietro Baita

IPC: C08F6/00 ,  B29B13/02 ,  B29B9/12 ,  B29C47/00 ,  C08F10/00 ,  B29B13/00 ,  B01J8/18 ,  B01J8/24 ,  B01J8/00 ,  B29L31/00 ,  B29K23/00

Abstract: Process for preparing a polyolefin polymer comprising the steps of a) forming a particulate polyolefin polymer by polymerizing one or more olefins in the presence of a polymerization catalyst system in a polymerization reactor; b) discharging the formed polyolefin particles from the polymerization reactor; c) degassing the polyolefin particles by a process comprising at least a final step of contacting the polyolefin particles with a nitrogen stream in a degassing vessel; and d) transferring the polyolefin particles from the vessel, in which the contacting of the polyolefin particles with the nitrogen stream is carried out, to a melt mixing device, in which the polyolefin particles are melted, mixed and thereafter pelletized, without passing the particles through a buffering device, wherein the degassing vessel is only partly filled with polyolefin particles and the empty volume within the degassing vessel is sufficient to take up additional polyolefin particles for at least 3 hours if the transfer of polyolefin particles of step d) from the degassing vessel to the melt mixing device is discontinued and the discharge of polyolefin particles from the polymerization reactor according to step b) is continued with unchanged rate.

公开(公告)号：US20140309384A1

公开(公告)日：2014-10-16

申请号：US14362842

申请日：2012-12-04

Applicant: Basell Polyolefine GmbH

Inventor： Massimo Covezzi ,  Giuseppe Penzo ,  Gabriele Mei ,  Giulia Mei ,  Pietro Baita ,  Gerhardus Meier ,  Antonio De Lucia ,  Ulf Schueller ,  Gianpiero Ferraro

IPC: C08F110/02

CPC classification number: C08F110/02 ,  C08F2/001 ,  C08F2/34 ,  C08F10/00 ,  C08F10/02 ,  C08F2500/12 ,  C08F2500/18 ,  C08F2500/24 ,  C08F2/00 ,  C08F2/01

Abstract: 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 ofintroducing 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; andtransferring 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.

Abstract translation: 在至少两个串联连接的气相聚合反应器中进行的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移动到底部的聚烯烃颗粒床，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向上流; 从沉降管的下端取出聚烯烃颗粒; 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从聚烯烃中排出聚烯烃颗粒的方法 流化床反应器。