Title:
チーグラー・ナッタ触媒とクロムベース触媒との間の移行方法
Document Type and Number:
Japanese Patent JP2008524430
Kind Code:
A
Abstract:
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.
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Inventors:
Mark G. Good
Kevin Jay Can
David F. Hussein
Robert El. Santana
David C. Schutz
Agapios Kay. Agapiu
Kevin Jay Can
David F. Hussein
Robert El. Santana
David C. Schutz
Agapios Kay. Agapiu
Application Number:
JP2007548455A
Publication Date:
July 10, 2008
Filing Date:
December 21, 2005
Export Citation:
Assignee:
Univations Technologies LLC
International Classes:
C08F10/00; C08F2/00
Attorney, Agent or Firm:
Axis International Patent Business Corporation