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US 5,672,665 AGranted
Process for transitioning between incompatible polymerization catalysts
AssigneeExxon Chemical Patents Inc.
InventorsAgapios Kyriacos Agapiou, Michael Elroy Muhle, Gary Thomas Renola
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Abstract
This invention relates to a process for transitioning between incompatible polymerization catalyst systems. Particularly, the invention relates to a process for transitioning from an olefin polymerization reaction utilizing a traditional Ziegler-Natta catalyst system to a metallocene-olefin polymerization reaction.
Claims6
A process for transitioning from at least two incompatible catalysts in a gas phase polymerization process occurring in at least one reactor having a fluidized bed, the process comprising the steps of:
- a) discontinuing the introduction of a Ziegler-Natta catalyst;
- b) contacting said fluidized bed with a reversible catalyst killer;
- c) contacting said fluidized bed with an irreversible catalyst killer;
- d) titrating said fluidized bed with an organometallic compound;
- e) introducing a metallocene catalyst into said reactor.
2 more elements
Dependencies are inferred from the claim text.