C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 2/34 (2006.01) C08F 10/00 (2006.01)
Patent
CA 2212787
The present invention provides 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) to produce a polymer in a fluidised bed reactor which process comprises: (0) continuously withdrawing from the reactor a gaseous stream comprising unreacted olefin monomer and having entrained therein catalyst and/or polymer particles; (1) continuously recycling said gaseous stream comprising unreacted olefin monomer through a fluidised bed in said reactor in the presence of a polymerisation catalyst under reactive conditions; (2) cooling by means of heat exchanger(s) at least part of said gaseous stream withdrawn from said reactor to a temperature at which liquid condenses out; (3) separating at least part of the condensed liquid from the gaseous stream; and (4) introducing a first part of the separated liquid directly into the fluidised bed, characterised in that a second part of the separated liquid is reintroduced into the recycle gaseous stream before said heat exchanger(s). The present process allows the heat exchanger(s) to be continuously and efficiently cleared from the fines. Further the use of a gas cyclone separator in the recycle stream can be eliminated.
Leaney Patrick
Morterol Frederic
Bp Chemicals Limited
Fetherstonhaugh & Co.
Ineos Europe Limited
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