Patent ID: 8344077
Filing Date: 2013-01-01
Classification: B01J,C08F

Abstract:
1. A method for reducing sedimentation and subsequent clogging in a transfer line from one loop reactor to another for the polymerization of olefins comprising: setting a temperature in a first reactor at a margin of from 5 to 7° C. lower than a swelling temperature; increasing a pressure drop Δp between the first and second reactors to a Δp of from 1 to 5 bars and synchronising reactor discharges; decreasing a residence time in each settling leg of the first reactor to a period of time such that the polymerisation performed within the settling legs does not induce a temperature elevation larger than the margin; and adjusting a rotational speed of a product take off (PTO) valve located at the exit of each settling leg towards the transfer line in order to remove all sedimented polymer.