Exxonmobil Chemical Patents Inc.

Univation Technologies, LLC

Sandy Clay Hinds

Robert Olds Hagerty

Thomas Redden Veariel

D Brett Fischbuch

Diwaker Singh

Douglas R Holroyd

Ai Vey Ng

George Varcelia Yenetchi

Diwalker Singh

Thierry Polchlopek

Brett D Fischbuch

The present invention relates to a continuous gas phase process comprising passing a recycle stream through a fluidized bed in a gas phase fluidized bed reactor, wherein the recycle stream comprises a low molecular weight dew point increasing component and a high molecular weight component, polymerizing an alpha-olefin monomer in the presence of a catalyst, and controlling an amount of the low molecular weight dew point increasing component in the recycle stream such that a dew point approach temperature of the recycle stream is less than the dew point approach temperature when operating with the higher molecular weight dew point increasing component alone.

Low molecular weight induced condensing agents

The present invention is a process for transitioning from a first polymerization catalyst system to a second polymerization catalyst system incompatible with the first polymerization catalyst system in a gas-phase reactor. The novel process comprises conducting a first polymerization reaction using a first polymerization catalyst system; stopping the first polymerization reaction; removing the contents of the first polymerization reaction from the reactor while maintaining a substantially closed system; then, in the substantially closed system, introducing a substantially contaminant free seedbed into the reactor; introducing a second feed system and a second catalyst system into the reactor; and conducting a second polymerization reaction.

Method for transitioning from a catalyst to an incompatible catalyst in a gas-phase reactor

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Crosby, TX, United States of America

Sandy Clay Hinds