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US 2014/0213743 A1Published application
Particulate Metallocene-Alumoxane Catalyst
AssigneeTotal Research & Technology Feluy
InventorMartine Slawinski
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Abstract
The invention relates to a process for the preparation of a particulate polyethylene product in a loop reactor, wherein the polymerization catalyst applied in the polymerization process comprises a particulate metallocene-alumoxane catalyst immobilized on a porous silica support; and whereby said metallocene-alumoxane catalyst is heterogeneously distributed on said porous silica support.
Claims21
1-15. (canceled)
A process for preparing a particulate polyethylene product in a loop reactor comprising:
- polymerizing ethylene monomers in the presence of a polymerization catalyst comprising a particulate metallocene-alumoxane catalyst immobilized on a porous support, wherein the alumoxane is heterogeneously distributed on the porous support.
A particulate polyethylene product formed by:
- feeding ethylene monomer, a liquid hydrocarbon diluent, optionally hydrogen, and optionally olefin co-monomer into a loop reactor;
- feeding a polymerization catalyst into the loop reactor;
- polymerizing the ethylene monomer and optionally the co-monomer to produce a polyethylene slurry in the liquid hydrocarbon diluent in the loop reactor;
- allowing the polyethylene slurry to settle into one or more settling legs connected to the loop reactor;
- discharging the settled polyethylene slurry from the one or more settling legs out of the loop reactor;
- and
- flashing off the diluent and unreacted monomers;
- wherein the polymerization catalyst comprises a particulate metallocene-alumoxane catalyst immobilized on a porous silica support, wherein the alumoxane is heterogeneously distributed on the porous silica support.
5 more elements
Dependencies are inferred from the claim text.