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US 9,433,914 B2Granted
Polyolefin reactor system having a gas phase reactor
AssigneeChevron Phillips Chemical Company LP
InventorsGregory G. Hendrickson, Leonard E. Powell, Michael A. Rhodes, Joel Mutchler, Bruce E. Kreischer, Maruti Bhandarker, Rebecca A. Gonzales, Bruce H. Marantis
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Abstract
A system and method for polymerizing olefin in a gas phase reactor into a polyolefin in presence of catalyst, measuring static charge in the reactor system; determining an indication of polyolefin fines in the reactor system, and adjusting operation of the reactor system in response to the indication.
Claims19
A polyolefin reactor system comprising:
- a gas phase reactor configured to polymerize olefin into a polyolefin in presence of a catalyst;
- a static charge probe configured to measure static electricity in the gas phase reactor;
- and
- a control system configured to determine polyolefin fines accumulation in the gas phase reactor based on the measured static electricity and anticipated polyolefin fines accumulation in the gas phase reactor based on a transition to a different catalyst, and the control system configured to adjust an addition rate of antistat to the gas phase reactor in response to the determination.
1 more element
A reactor system comprising:
- a gas phase reactor configured to polymerize olefin into a polyolefin in presence of a catalyst;
- an overhead system configured to receive overhead gas from the gas phase reactor, the overhead gas having entrained polyolefin fines from the gas phase reactor;
- a plurality of static charge probes configured to measure static charge at different locations in the reactor system;
- and
- a control system configured to detect polyolefin fines accumulation in the reactor system based on the measured static charge and anticipated polyolefin fines accumulation in the reactor system based on a transition to a different catalyst, and the control system configured to adjust an addition rate of antistat to the reactor system in response to the detecting polyolefin fines accumulation.
2 more elements
A polyolefin reactor system comprising:
- a gas phase reactor configured to polymerize olefin into a polyolefin in presence of a catalyst;
- a catalyst feed system configured to feed the catalyst to the gas phase reactor and to transition to feeding a different catalyst to the gas phase reactor without interrupting the polymerizing of the olefin to a polyolefin in the gas phase reactor;
- a static charge probe configured to measure static electricity in the gas phase reactor;
- and
- a control system configured to determine polyolefin fines accumulation in the gas phase reactor based on the measured static electricity and to adjust an addition rate of antistat to the gas phase reactor in response to the determination.
2 more elements
Dependencies are inferred from the claim text.