Exxonmobil Chemical Patents Inc.

Exxonmobil Technology and Engineering Company

Benjamin J Ohran

David Jack Sandell

Apostolos T Georgiou

Michael G Tribo

Aaron C McGinnis

Michael D Lucas

Handel D Bennett

Onur Onel

Christopher W Graham

Jitendra V Kadam

David T Lakin

Tyler A Soderstrom

Yunfei Chu

Nathaniel B Guy

Stacy N Apugo

Methods and systems for performing transient processes may include: providing a path and path thresholds for an operational condition as a function of progress of a transient process based on historical data of previously performed transient processes; performing the transient process in a chemical reactor using operational parameters; measuring the operational condition of the transient process as a function of the progress of the transient process; and adjusting one or more of the operational parameters during the progress of the transient process to maintain the operational condition within the path thresholds.

Methods and systems for performing transient processes

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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Benjamin J Ohran