Process for the gas-phase polymerization of olefins in a fluidiz

Details Process for the gas-phase polymerization of olefins in a fluidiz Process for the gas-phase polymerization of olefins in a fluidiz

1989-06-21

1991-07-02

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 74, 526 79, 526 88, 526901, 528484, C08F 234

Patent

active

050286706

ABSTRACT:
The present invention relates to a process and apparatus for the gas-phase polymerization of olefins in a fluidized-bed reactor maintained at a temperature T1. A gaseous reaction mixture comprising the olefins to be polymerized 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 volatilizing 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 fluidized-bed at the desired temperature T1.

REFERENCES:
patent: 4012573 (1977-03-01), Trieschmann et al.
patent: 4390669 (1983-06-01), Morita et al.

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