Patent ID: 7736597
Filing Date: 2010-06-15
Classification: B01J,C08F

Abstract:
1. A loop reactor system, comprising: a pipe loop reactor configured for conducting an olefin polymerization process comprising polymerizing at least one olefin monomer in liquid diluent to produce a fluid slurry comprising solid olefin polymer particles in the liquid diluent, wherein the pipe loop reactor comprises a volume of at least 20,000 gallons, and wherein the at least one olefin monomer comprises ethylene, propylene, or a combination thereof; a diluent feed attached to the pipe loop reactor; a monomer feed attached to the pipe loop reactor; a catalyst feed attached to the pipe loop reactor; a product take-off attached to the pipe loop reactor; a first mixed flow pump disposed within the pipe loop reactor, wherein the first mixed flow pump is configured to circulate the fluid slurry having a solids concentration between 40 and 75 weight percent; and a second mixed flow pump disposed within the loop reactor such that rotational energy imparted on the fluid slurry by the first mixed flow pump is partially recovered by the second mixed flow pump, wherein the first mixed flow pump comprises a first impeller configured to turn in a first direction and the second mixed flow pump comprises a second impeller configured to turn in a second direction that is the same as or opposite the first direction.