发明名称 |
PROCESS FOR TRANSITIONING BETWEEN ZIEGLER-NATTA-BASED AND CHROMIUM-BASED CATALYSTS |
摘要 |
<p>Embodiments of our invention relate to processes for transitioning among polymerization catalyst systems including processes for transitioning among olefin polymerization reactions using Ziegler-Natta catalysts systems and chromium-based catalyst systems. Among embodiments contemplated are a method of transitioning from a first catalyst to a second catalyst in an olefin polymerization reactor, comprising: adding to the reactor a deactivating agent (DA) selected from one of carbon monoxide, carbon dioxide, or combinations thereof; adding to the reactor a cocatalyst adsorbing agent (CAA), comprising an inorganic oxide selected from one of silica, alumina or combinations thereof; wherein the first catalyst comprises at least one conventional Ziegler-Natta catalyst, and a cocatalyst, wherein the second catalyst comprises at least one chromium-based catalyst, wherein the reactor is a gas-phase, fluidized bed reactor, and wherein the CAA is substantially free of transition metals. In another embodiment a method of transitioning from a first catalyst to a second catalyst in an olefin polymerization reactor is contemplated, comprising: adding a transition aid agent (TAA) wherein the TAA is selected from one of alkoxylated amines, alkoxylated amides, or combinations thereof, wherein the first catalyst comprises at least one Ziegler-Natta catalyst comprising the catalyst, a cocatalyst and optionally a support, and the second catalyst comprises at least one chromium-based catalyst.</p> |
申请公布号 |
EP1833854(B1) |
申请公布日期 |
2010.10.13 |
申请号 |
EP20050855113 |
申请日期 |
2005.12.21 |
申请人 |
UNIVATION TECHNOLOGIES, LLC |
发明人 |
GOODE, MARK, G.;CANN, KEVIN, J.;HUSSEIN, DAVID, F.;SANTANA, ROBERT, L.;SCHUTZ, DAVID C.;AGAPIOU, AGAPIOS, K. |
分类号 |
C08F2/42;C08F2/34;C08F10/00 |
主分类号 |
C08F2/42 |
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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