Patent ID: 8629223

Claim:
Method for initiating polymerization of ethylene monomers in a loop reactor, which is a first loop reactor of a double loop reactor, wherein the first loop reactor and a second loop reactor are connected to each other in series, wherein the method comprising the subsequent steps of: (a) feeding into said ethylene polymerization loop reactor a liquid hydrocarbon diluent ethylene monomers and hydrogen; (b) feeding into said ethylene polymerization loop reactor at least one metallocene polymerization catalyst; and (c) polymerizing said ethylene monomers to produce a polyethylene slurry comprising the liquid hydrocarbon diluent and solid polyethylene particles; characterized by feeding the hydrogen into said ethylene polymerization loop reactor prior to feeding the at least one metallocene polymerization catalyst into said ethylene polymerization loop reactor; and further characterized by feeding hydrogen into said second loop reactor of said double loop reactor.