Method for polymerization of olefin

Details Method for polymerization of olefin Method for polymerization of olefin

2005-05-10

2005-05-10

Elve, M. Alexandra (Department: 1725)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Organic polymerization

Reexamination Certificate

active

06890494

ABSTRACT:
The present invention is directed to a method for polymerizing olefins in a multi-stage polymerization apparatus including a gas-phase polymerization reactor in a subsequent stage. By use of the present method, the composition of gas in the gas-phase reactor is easily adjusted, and moreover, a polymer having an intended composition is produced in a consistent manner. In one aspect, the method for polymerizing olefins is performed in successive, multiple stages by use of a plurality of polymerization reactors disposed in series which include at least one gas-phase polymerization reactor after a first reactor, wherein a multi-component gas is removed from a gas-phase reactor and pressurized and/or cooled to thereby liquefy a portion of the gas; at least a portion of gas is discharged; and the remaining gas and the liquid are returned to the gas-phase reactor.

REFERENCES:
patent: 5541270 (1996-07-01), Chinh et al.
patent: 5556820 (1996-09-01), Funabashi et al.
patent: 5728353 (1998-03-01), Govoni et al.

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