Method for improving ethylene polymerization reactions

摘要

The present invention relates to a method for initiating an ethylene polymerization reaction in an ethylene polymerization loop reactor. More particularly, the invention relates to the timing upon which hydrogen is introduced into the ethylene polymerization loop reactor. The catalysts used in the ethylene polymerization reaction according to present invention are preferably metallocene catalysts.

主权项

1. A method for initiating polymerization comprising:
feeding one or more monomers and hydrogen into a loop reactor, wherein the one or more monomers comprise ethylene monomers, and wherein the loop reactor is a single loop reactor or a double loop reactor; feeding at least one polymerization catalyst into the loop reactor; polymerizing the one or more monomers; and removing polymer slurry from the loop reactor through one or more product recovery lines to a product recovery zone; characterized by feeding the hydrogen into the loop reactor prior to feeding the at least one polymerization catalyst into the loop reactor.