C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
23/379, 402/614
C08F 2/34 (2006.01) B01J 8/24 (2006.01) C08F 10/00 (2006.01)
Patent
CA 1322625
ABSTRACT OF THE DISCLOSURE Process and Apparatus for the gas-phase polymerization of olefins in a fluidised-bed reactor The present invention relates to a process and apparatus for the gas-phase polymerisation of olefins in a fluidised-bed reactor maintained at a temperature T1. A gaseous reaction mixture comprising the olefins to be polymerised passes through the reactor and is recycled to the reactor by means of a recycling line comprising successively a first heat transfer means, a compressor and a second heat transfer means. The present invention consists in introducing a readily volatile liquid hydrocarbon into the inlet of the first heat transfer means or into the recycling line, upstream and in the vicinity of the first heat transfer means. The first heat transfer means cools the gaseous reaction mixture to a temperature T2, below T1, while volatilising the readily volatile hydrocarbon and without condensing a constituent of the gaseous reaction mixture. The second heat transfer means cools the gaseous reaction mixture to a temperature T3, below T2, for maintaining the fluidised-bed at the desired temperature T1.
604357
Chinh Jean-Claude
Dumain Andre
Bp Chemicals Limited
Fetherstonhaugh & Co.
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