C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 2/34 (2006.01) B01J 8/24 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01) C08F 4/659 (2006.01) C08F 210/16 (2006.01)
Patent
CA 2508761
The invention relates to processes for transitioning from a first polymerization reaction with a first catalyst system to a second polymerization reaction with a second catalyst system where the first and second catalyst systems are incompatible. The polymerization reaction is conducted in a polymerization zone of a gas phase fluidized bed reactor which contains a fluidized bed of polymer particles by an essentially continuous passage of monomer gases through the polymerization zone. The process comprises a) discontinuing the introduction of the first catalyst system into the reactor; b) lowering the height of the bed of polymer particles from a first height to a second height; c) conducting essentially concurrently with the reduction of the bed height, at least one modification which is reducing the partial pressure of the monomer gases within the polymerization zone from a first partial pressure to the second lower partial pressure or introducing an alkoxylated amide or amine into the reactor; d) introducing the second catalyst system into the reactor; and e) increasing the bed height to a level above the level of the second height.
L'invention porte sur des processus de transition entre différents systèmes de catalyseurs de polymérisation, de préférence entre des systèmes de catalyseurs incompatibles entre eux, ainsi que sur des processus de transition entre des réactions de polymérisation d'oléfines utilisant des systèmes de catalyseurs Ziegler-Natta, des systèmes de catalyseurs aux métallocènes, et des systèmes de catalyseurs à base de chrome.
Burdett Ian D.
Cai Ping P.
Eisinger Ronald S.
Goode Mark G.
Hussein F. David
Borden Ladner Gervais Llp
Univation Technologies Llc
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