发明名称 |
PROCESS FOR THE GAS-PHASE POLYMERIZATION OF OLEFINS |
摘要 |
Process for the gas-phase polymerization of one or more alpha-olefins in the presence of a catalyst system, the process comprising: contacting in a continuous way one or more of said alpha-olefins with said catalyst system in a prepolymerization reactor, wherein the reaction is carried out in a liquid medium at a temperature ranging from 23° to 50° C.; feeding in continuous the prepolymer obtained in step a) into a gas-phase reactor having interconnected polymerization zones, where the growing polymer particles flow upward through a first polymerization zone (riser) under fast fluidization or transport conditions, leave said riser and enter a second polymerization zone (downcomer) through which they flow downward under the action of gravity, leave said downcomer and are reintroduced into said riser; wherein the prepolymer obtained from step a) is continuously fed at a section of said riser characterized by an upwardly gas velocity higher than 3.0 m/s. |
申请公布号 |
CA2583580(A1) |
申请公布日期 |
2006.04.20 |
申请号 |
CA20052583580 |
申请日期 |
2005.09.19 |
申请人 |
BASELL POLIOLEFINE ITALIA S.R.L. |
发明人 |
BERTOLINI, STEFANO;MEI, GABRIELE;COVEZZI, MASSIMO |
分类号 |
C08F10/00;C08F2/01;C08F2/34 |
主分类号 |
C08F10/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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