Catalyst slurry preparation system and use thereof

摘要

The present invention relates to the use of a catalyst preparation system for the preparation of a diluted catalyst slurry. In particular, the invention relates to a catalyst preparation system comprising a mixing vessel for mixing a particulate catalyst and a liquid hydrocarbon diluent. According to the invention, diluted catalyst slurry is prepared in a mixing vessel comprising a rotatable axial impeller system comprising at least two double-bladed hubs. The invention also relates to a process for preparing diluted catalyst slurry for use in the preparation of a particulate polyethylene product in a loop reactor with the catalyst preparation system as described herein.

主权项

1. A catalyst slurry preparation system for the preparation of a diluted catalyst slurry comprising a solid particulate catalyst and a liquid hydrocarbon diluent, wherein said catalyst slurry preparation system comprises:
a mixing vessel comprising a top part, a bottom part and a rotatable impeller system which is actuated by a motor; wherein the rotatable impeller system comprises a magnetic actuated agitator shaft which is positioned along a longitudinal axis of said mixing vessel and extends through said top part of said mixing vessel and comprises at least two double-bladed hubs which are fixed to said magnetic actuated agitator shaft, wherein each double-bladed hub is a hub comprising two blades; wherein each blade of each double-bladed hub is an airfoil comprising a root portion attached to the hub and a radially outwardly disposed tip portion with an upper side edge therebetween, wherein the upper side edge faces the top part of said mixing vessel, and wherein each blade comprises a lower side edge facing said bottom part of said mixing vessel; and wherein said tip portion inclines convexly toward said top part of said mixing vessel beyond said upper side edge, wherein said upper side edge extends laterally from said root portion to said tip portion and inclines concavely toward said tip portion, and wherein said lower side edge is concave.