Patent ID: 9394382
Filing Date: 2016-07-19
CPC Classification: C08F

Claim Text:
1. A process for the gas phase polymerisation of olefins in a fluidised bed reactor, which process comprises: a) passing a fluidising gas comprising one or more olefin monomers through a fluidised bed of polymer particles in the presence of a polymerisation catalyst to produce polymer at a polymer production rate of C Tonnes/hour, b) withdrawing a first gaseous stream comprising solid particles from the top of the reactor, c) passing the first gaseous stream to a gas/solids separator, separating solid particles therefrom, and forming a second gaseous stream comprising residual solid particles, d) passing at least a portion of the second gaseous stream to one or more heat exchangers to remove heat of reaction, wherein residual solid particles contact the heat exchanger, and e) recycling at least a portion of the cooled stream from step (d) as the fluidising gas in step (a), wherein the one or more heat exchangers have a heat exchange surface area which totals less than 120×C m