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US 2007/0185288 A1Published application
Catalyst grain size
AssigneeTotal Petrochemicals Research Feluy
InventorsDaniel Siraux, Etienne Laurent
Life of this patent
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Abstract
The present invention discloses an olefin polymerisation process carried out in the presence of a Ziegler-Natta catalyst in two liquid full loop reactors connected in series wherein different molecular weight fractions are produced to form a polyolefin, said process being characterised in that the Ziegler-Natta catalyst has a particle size distribution d50 of less than 20 pm and greater that 5 pm.
Claims12
1-9. (canceled)
A method for the polymerization of an olefin in a double loop reactor system having first and second interconnected loop reactors comprising:
- a) introducing an olefin monomer, and a diluent carrier liquid into a first loop reactor of said reactor system;
- b) supplying to said first loop reactor a polymerization catalyst system comprising a supported Ziegler-Natta catalyst component having a particle size distribution d50 within the range of 5 μm to 20 μm;
- c) circulating said diluent liquid and olefin monomer through said first loop reactor while polymerizing said olefin monomer in the presence of said catalyst system to produce a slurry of polymer fluff particles in said diluent carrier liquid;
- d) withdrawing said slurry from said first loop reactor and supplying said withdrawn slurry to said second loop reactor;
- e) introducing an olefin monomer and a diluent carrier liquid into said second loop reactor;
- f) circulating said diluent liquid and olefin monomer through said second loop reactor while polymerizing said olefin monomer in the presence of said catalyst system to produce a slurry of olefin polymer particles in said diluent liquid in said second reactor;
- and
- g) recovering said olefin polymer from said second loop reactor.
5 more elements
Dependencies are inferred from the claim text.