Process for preparing polyolefins and use of antifouling agents therein

摘要

The present invention relates to a process of preparing a polyethylene in a loop reactor in the presence of antifouling agent comprising the steps of:
a) feeding into said loop reactor diluent, monomers, optionally hydrogen, and optionally one or more co-monomers to produce a liquid phase;b) introducing antifouling agent into said loop reactor,c) introducing a catalyst into the liquid phase to produce a slurry; andd) polymerizing the monomers and optional co-monomers to form the polyethylene, characterized in that the time difference between introduction of the antifouling agent and introduction of the catalyst is at most 3 hours.

主权项

1. A process of preparing polyethylene in a loop reactor in the presence of antifouling agent comprising:
feeding into said loop reactor diluent, monomers, optionally hydrogen, and optionally one or more co-monomers to produce a liquid phase; introducing a catalyst and an antifouling agent into said loop reactor, wherein the antifouling agent is introduced into said loop reactor either before or after the catalyst is introduced into said loop reactor; wherein introduction of said catalyst into the liquid phase produces a slurry; and polymerizing the monomers and optional co-monomers to form the polyethylene, characterized in that a time difference between the introduction of the antifouling agent and the introduction of the catalyst is at most 3 hours, and wherein either: the antifouling agent is introduced in said loop reactor at most 3 hours before and at least 1 minute before the introduction of the catalyst in the liquid phase, or the antifouling agent is introduced in said loop reactor at least 1 minute after and at most 1 hour after the introduction of the catalyst in said liquid phase.