Patent ID: 9556283
Date: 2017-01-31
CPC Classifications: B01J,C08F

Claim:
1. A method of operating a polyethylene reactor system, comprising: discharging continuously a transfer slurry from a first polymerization reactor through a first transfer line to a second polymerization reactor, the transfer slurry comprising diluent and a first polyethylene; discharging a product slurry from a second polymerization reactor, the product slurry comprising diluent, the first polyethylene, and a second polyethylene; calculating, during operation of the system, a pressure loss in the first transfer line by, measuring, during operation of the system, a pressure differential through the first transfer line to determine a measured pressure differential and adjusting a process variable in response to the measured pressure differential exceeding the calculated pressure loss by a specified amount, wherein the adjusting of the process variable comprises increasing and/or allowing pressure to increase in the first polymerization reactor, lowering slurry viscosity in the first polymerization reactor, lowering pressure in the second polymerization reactor, or placing in service a second transfer line and discharging continuously at least a portion of the transfer slurry from the first polymerization reactor through the second transfer line to the second polymerization reactor.