Exxonmobil Chemical Patents Inc.

George Varcelia Yenetchi

Thomas Redden Veariel

Sandy Clay Hinds

Diwalker Singh

Thierry Polchlopek

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.

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Baytown, TX, United States of America

George Varcelia Yenetchi