Patent ID: 7718139
Filing Date: 2010-05-18
Classification: B01J,C08F

Abstract:
1. An apparatus for polymerizing olefins, comprising: (a) a fluidized bed reactor for contacting one or more olefins with a catalyst under polymerization conditions to form an ascending gas stream comprising fine polymer particles and unreacted olefins; (b) a fines separator in fluid communication with the fluidized bed reactor for separating the fine polymer particles from the unreacted olefins; and (c) a vertically oriented fines ejector in fluid communication with the fines, separator for conveying 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, and wherein the vertically oriented fines ejector comprises an annulus for introducing an annular stream of a motive gas around a stream of the fine polymer particles.