公开(公告)号：US10358509B2

公开(公告)日：2019-07-23

申请号：US15559792

申请日：2016-03-23

Applicant: Basell Polyolefine GmbH

Inventor： Volker Fraaije ,  Michael Lynch ,  Shahram Mihan ,  Gerhardus Meier ,  Ulf Schueller

IPC: C08F10/02

Abstract: The present disclosure relates to a continuous process for the preparation of ethylene homopolymers or ethylene copolymers comprising polymerizing ethylene or copolymerizing ethylene and one or more other olefins in the presence of a chromium catalyst in a gas-phase polymerization reactor which is equipped with a cycle gas line for withdrawing reactor gas from the reactor, leading the reactor gas through a heat-exchanger for cooling and feeding the reactor gas back to the reactor, wherein the polymerization is carried out at a temperature from 30° C. to 130° C. and a pressure of from 0.1 to 10 MPa and an aliphatic carboxylic acid ester having from 8 to 24 carbon atoms is added.

公开(公告)号：US20180079842A1

公开(公告)日：2018-03-22

申请号：US15559792

申请日：2016-03-23

Applicant: Basell Polyolefine GmbH

Inventor： Volker Fraaije ,  Michael Lynch ,  Shahram Mihan ,  Gerhardus Meier ,  Ulf Schueller

IPC: C08F10/02

CPC classification number: C08F10/02 ,  C08F2500/07 ,  C08F210/16 ,  C08F2/005 ,  C08F2/007 ,  C08F210/14 ,  C08F2500/12 ,  C08F2500/13 ,  C08F2500/14 ,  C08F2500/26 ,  C08F4/24

Abstract: The present disclosure relates to a continuous process for the preparation of ethylene homopolymers or ethylene copolymers comprising polymerizing ethylene or copolymerizing ethylene and one or more other olefins in the presence of a chromium catalyst in a gas-phase polymerization reactor which is equipped with a cycle gas line for withdrawing reactor gas from the reactor, leading the reactor gas through a heat-exchanger for cooling and feeding the reactor gas back to the reactor, wherein the polymerization is carried out at a temperature from 30° C. to 130° C. and a pressure of from 0.1 to 10 MPa and an aliphatic carboxylic acid ester having from 8 to 24 carbon atoms is added.