公开(公告)号：US20010019706A1

公开(公告)日：2001-09-06

申请号：US09818915

申请日：2001-03-28

Applicant: Idemitsu Petrochemical Co., Ltd.

Inventor： Hideki Satou ,  Youichi Matsuo ,  Itaru Matsuhiro

IPC: C08F002/34 ,  C08F010/00

CPC classification number: B01J8/1809 ,  B01J2208/00256 ,  B01J2208/00274 ,  B01J2219/00006 ,  C08F10/00 ,  C08F110/02 ,  C08F110/06 ,  C08F210/06 ,  C08F2/001 ,  C08F2/34 ,  C08F210/08 ,  C08F210/16 ,  C08F2500/01

Abstract: The present invention is directed to a method for polymerizing olefins in a multi-stage polymerization apparatus including a gas-phase polymerization reactor in a subsequent stage. By use of the present method, the composition of gas in the gas-phase reactor is easily adjusted, and moreover, a polymer having an intended composition is produced in a consistent manner. In one aspect, the method for polymerizing olefins is performed in successive, multiple stages by use of a plurality of polymerization reactors disposed in series which include at least one gas-phase polymerization reactor after a first reactor, wherein a multi-component gas is removed from a gas-phase reactor and pressurized and/or cooled to thereby liquefy a portion of the gas; at least a portion of gas is discharged; and the remaining gas and the liquid are returned to the gas-phase reactor.