Patent ID: 9162204
Filing Date: 2015-10-20
Classification: B01J,C08F

Abstract:
1. A double loop reactor system comprising: a first loop reactor and a second loop reactor in series having a flow path for a polymer slurry, wherein the polymer slurry comprises monomer, one or more optional co-monomers, a polymerization catalyst, liquid diluent and solid ethylene polymer particles; multiple feedings for feeding hydrogen into the double loop reactor, which are positioned spatially separated along a path of the double loop reactor, wherein the location of the multiple feedings for feeding hydrogen are chosen by a function of hydrogen/monomer ratio; a pump suitable for maintaining the polymer slurry in circulation in said reactor; one or more controllers adapted to control a hydrogen:monomer along the flow path by feeding hydrogen into the multiple feedings for feed hydrogen and reducing the variation in the hydrogen:monomer ratio between the ratio at the double loop reactor inlet and at the double loop reactor outlet to a variation that is lower than 40%; one or more settling legs connected to the pipes of the double loop reactor for settling of polymer slurry; and one or more lines for discharging settled polymer slurry out of the double loop reactor.