Patent ID: 7851566

Claim:
A double loop reactor system suitable for the polymerization of an olefin comprising: a) a first loop reactor having an inlet for the introduction of an olefin monomer and a diluent carrier liquid into said first loop reactor; b) a pump in said first loop reactor for circulating diluent liquid and olefin monomer through said first loop reactor to provide for the polymerization of said monomer to produce a slurry of polymer particles in said diluent liquid; c) a second loop reactor having an inlet for the introduction of an ethylene monomer and a diluent carrier liquid into said second loop reactor; d) a pump in said second loop reactor for circulating diluent liquid and olefin monomer through said second loop reactor to provide for the polymerization of said monomer to produce a slurry of polymer particles in said diluent liquid; e) a transfer line extending from an outlet in said first loop reactor to said second loop reactor to transfer polymer slurry from said first loop reactor to said second loop reactor; and f) a recycle line extending from an outlet in said second loop reactor to a recycle inlet in said first loop reactor to recycle polymer slurry from said second loop reactor back to said first loop reactor.