Patent ID: 8258245
Filing Date: 2012-09-04
Classification: B01J,C08F

Abstract:
1. A method for supplying a catalyst to an ethylene slurry loop polymerization reactor comprising: a) preparing a catalyst slurry in a preparation vessel wherein said slurry comprises a hydrocarbon diluent liquid which contains a Ziegler-Natta catalyst; b) supplying said catalyst slurry from said preparation vessel to a buffer vessel; c) withdrawing said catalyst slurry from said buffer vessel and supplying said catalyst slurry to a slurry loop polymerization reactor in which ethylene is polymerized; d) mixing a co-catalyst with the Ziegler-Natta catalyst in said slurry prior to the supplying of said catalyst slurry to said slurry loop polymerization reactor; and e) controlling the transfer of catalyst slurry from said preparation vessel to said buffer vessel and the withdrawal of catalyst slurry from said buffer vessel to maintain the level of catalyst slurry in said buffer vessel at 80 to 90 percent.