BigPatents India

A continuous gas fluidised bed process for the polymerisation of olefin monomer selected from (a) ethylene, (b) propylene, (c) mixtures of ethylene and propylene and (d) one or more other alpha olefins mixed with (a), (b) or (c), in a fluidised bed reactor by continuously recycling a gaseous stream comprising some of the ethylene and /or propylene through a fluidised bed in said reactor in the presence of a polymerization catalyst such as herein described under reactive conditions, part of said gaseous stream withdrawn from said reactor being passed through a separator, characterized in that: (a) the separator is charged with liquid; (b) the separator is maintained partially filled with liquid; (c) the gaseous stream fed to the separator has entrained therein catalyst and/or polymer particles; (d) substantially all of the entrained catalyst and/or polymer particles are separated from the gaseous stream in the separator and are maintained in a suspended state in the liquid in the separator and (e) optionally the liquid from the separator is introduced directly into the fluidized bed. and wherein the process takes place at a pressure between 0.5-6 MPs and a temperature of 30-130°C.