Exxonmobil Chemical Patents Inc.

David T Lakin

David Jack Sandell

Aaron C McGinnis

Handel D Bennett

Michael D Lucas

Benjamin J Ohran

Nathaniel B Guy

Stacy N Apugo

A process for producing an olefin polymer employs a gas phase polymerization reactor having a product discharge system comprising first and second pairs of lock hoppers, wherein each pair comprises an upstream lock hopper connected by valve means to the reactor and a downstream lock hopper connected by valve means to the upstream lock hopper and by further valve means to a product recovery system, and wherein a first cross-tie is provided between the upstream lock hoppers of the first and second pairs of lock hoppers and a second cross-tie is provided between the downstream lock hoppers of the first and second pairs of lock hoppers. Operation of the second cross-tie during product removal cycles is controlled in accordance with reactor pressure.

Olefin polymerization processes

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Houston, TX, United States of America

David T Lakin