Patent ID: 7744823

Claim:
A double loop reactor system suitable for the polymerization of an olefin comprising: a) a first slurry loop reactor having an inlet for the introduction of an olefin monomer and a diluent liquid medium into said first loop reactor; and having a first pump in said first loop reactor for circulating liquid medium 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 liquid medium; b) a second loop reactor connected in series with said first loop reactor and having a second a pump in said second loop reactor for circulating diluent liquid medium 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 liquid medium; c) an outlet in said second loop reactor to said second loop reactor to recover polymer product from said second loop reactor; d) a bypass line extending from a bypass inlet point connected in said second loop reactor to a bypass outlet point connected to said second loop reactor at a location downstream of said inlet point to recycle polymer slurry from said second loop reactor through said bypass line and back to said second loop reactor; and e) an outlet from said first loop reactor connected to said bypass line at a location intermediate of said bypass inlet and outlet points.