Title:
【発明の名称】?リエチレン調製プロ?ス
Document Type and Number:
Japanese Patent JPH10510570
Kind Code:
A
Abstract:
A process for producing polyethylene compositions in the presence of a catalytic system of ethylene polymerizing catalyst and cocatalyst in a multistage continuous reaction sequence consisting of successive liquid phase and gas phase polymerizations is disclosed. In the first step of the process, ethylene and optionally hydrogen and comonomer are polymerized in a first loop reactor in a low boiling hydrocarbon medium in the presence of ethylene polymerizing catalyst and cocatalyst. The reaction mixture is then removed and then transferred to a second loop reactor where polymerization is continued by addiing ethylene, hydrogen and optionally inert hydrocarbon, comonomers and cocatalysts. Thereafter, the reaction mixture is removed from the second loop reactor along with an essential part of the reaction medium and transferred to a gas phase reactor where polymerizing is continued in the presence of added ethylene and optionally hydrogen, comonomers and cocatalysts to form an end product. The residence time and reaction temperature being such that the proportion of the ethylene polymer produced in the first loop reactor to the end product of the process is between 1-20%.
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Inventors:
Pal loin, ant
Harlin, ants
Arninen, Antero
Toulouse, Ziuni
Sahira, aimo
Harlin, ants
Arninen, Antero
Toulouse, Ziuni
Sahira, aimo
Application Number:
JP51830596A
Publication Date:
October 13, 1998
Filing Date:
December 08, 1995
Export Citation:
Assignee:
Realis Re-Osaka Yu Tua
International Classes:
B01J8/24; B01J19/24; C08F2/06; C08F2/14; C08F2/34; C08F10/02; C08F210/16; (IPC1-7): C08F10/02; C08F2/14; C08F2/34
Attorney, Agent or Firm:
Akimoto Teruo