Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Organic polymerization
Reexamination Certificate
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.
Matsuhiro Itaru
Matsuo Youichi
Satou Hideki
Elve M. Alexandra
Idemitsu Petrochemical Co. Ltd.
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