Slurry phase polymerisation

Process for transferring a first slurry stream containing polymer through a transfer line from a polymerisation reactor to a downstream vessel, wherein prior to entry into the downstream vessel a second slurry stream which has been recycled from downstream is introduced into the first slurry stream, the second slurry introduction being located less than halfway along the transfer line between the reactor and the point of recycling downstream.

Process for transferring a slurry stream containing polymer through a transfer line from a polymerisation reactor to a downstream vessel, comprising prior to entry into the downstream vessel separating the slurry stream into two flows, the first flow being recycled upstream of the flow separation via a recycle line and the second flow being passed into the downstream vessel, and a third slurry stream which has been recycled from downstream is introduced into the second flow prior to its entry into the downstream vessel.

Process for transferring a slurry stream containing polymer and reagents through a transfer line from a first polymerisation reactor to a downstream vessel, comprising prior to entry into the downstream vessel maintaining the slurry stream under polymerisation conditions so as to reduce the concentration of at least one of the reagents present in the stream by at least 50 mol % whilst increasing the mass of the polymer present in the stream by no more than 5 wt % prior to introduction into the downstream vessel.