Polymerisation process

Process for the polymerisation of olefins comprising withdrawing at least part of a stream from a polymerisation reactor and passing the withdrawn stream through a fractionator which comprises a column having at least 3 equilibrium stages, wherein the stream withdrawn from the polymerisation reactor is fractionated at a pressure such that the principal diluent of the stream is substantially condensed without compression using only cooling medium at a temperature between 15 and 60° C.

Process for the polymerisation of olefins comprising withdrawing at least part of a stream from a polymerisation reactor and passing the withdrawn stream through a fractionator which comprises a column having at least 3 equilibrium stages, wherein at least the first two equilibrium stages in the fractionator are located above the feed location of the stream and have a stripping liquid flow that is at least 10 wt % of the vapour flow rate.

Process for the polymerisation of olefins comprising withdrawing at least part of a stream from a polymerisation reactor and passing the withdrawn stream through a fractionator with comprises a column having at least 3 equilibrium stages, which process is for the polymerisation of ethylene or propylene utilising more than one reactor in series, and the principal diluent is an inert diluent or monomer, wherein the fractionator is fed from more than one reactor and/or the fractionator feeds purified principal diluent to more than one reactor.