Patent ID: 9340629
Filing Date: 2016-05-17
CPC Classification: C08F

Claim Text:
1. A method of operating a polyethylene reactor system, the method comprising: polymerizing ethylene on a catalyst in a first polymerization reactor to form intermediate particles having the catalyst and a first polyethylene; discharging the intermediate particles from the first polymerization reactor to a second polymerization reactor; polymerizing ethylene on the catalyst in the intermediate particles in the second polymerization reactor to form product particles having the catalyst, the first polyethylene, and the second polyethylene; discharging the product particles from the second polymerization reactor; and controlling a particle size of the product particles by adjusting a residence time of the catalyst through the first polymerization reactor and/or the second polymerization reactor, wherein adjusting the residence time of the catalyst comprises adjusting a rate of a diluent feed stream to the first polymerization reactor.