| 摘要 |
The invention relates to continuous gas fluidised bed polymerisation of olefins, especially ethylene, propylene, or mixtures of these with other alpha olefins, wherein the monomer containing recycle gas employed to fluidise the bedis passed through a separator. The separator is charged with and maintained at least partially filled with liquid. Entrained catalyst and/or polymer particles are separated from the recycle gas in the separator and these separated particles are maintained in a suspended state in the liquid in the separator. The recycle stream can be cooled to condense out at least some liquid hydrocarbon; the condensed liquid, which can be a monomer or an inert liquid, is separated from the recycle gas in the separator and is fed directly to the bed to produce cooling by latent heat of evaporation. The process reduces fouling of the separator.
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