Patent ID: 7977436
Filing Date: 2011-07-12
Classification: B01J,C08F

Abstract:
1. A process for polymerizing olefins, comprising: (a) contacting one or more olefins with a catalyst in a fluidized bed reactor under polymerization conditions to form an ascending gas stream comprising fine polymer particles and unreacted olefins; (b) passing the ascending gas stream to a fines separator to separate the fine polymer particles from the unreacted olefins; (c) passing the fine polymer particles from the fines separator to a vertically oriented fines ejector; and (d) introducing a motive gas into the vertically oriented fines ejector to convey the fine polymer particles back to the fluidized bed reactor, wherein the fine polymer particles flow substantially vertically into the vertically oriented fines ejector and continue to flow substantially vertically upon exiting the ejector.