Process for polymerizing olefin in gas phase

Details Process for polymerizing olefin in gas phase Process for polymerizing olefin in gas phase

1996-02-12

1997-05-27

Weber, Thomas R.

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

Synthetic resins

Polymerizing in two or more physically distinct zones

526 88, 526901, C08F 234

Patent

active

056333331

ABSTRACT:
The present invention relates to a process for continuous gas-phase polymerization of olefin(s) in a fluidized and/or mechanically stirred bed reactor, comprising a stage of drawing off the polymer out of the reactor, wherein a portion of the bed is transferred into a lock hopper and is then isolated from the reactor in the lock hopper for a period of 5 to 120 seconds so that a substantial amount of the olefin(s) in the said portion polymerizes, before the polymer thus isolated in the said portion is discharged out of the lock hopper. The process advantageously reduces the amount of the gas drawn off with the polymer to be recycled into the reactor and improves the degassing of the polymer by the heat of the polymerization reaction during the isolation period in the lock hopper (FIG. 1).

REFERENCES:
Research Disclosure No. 149, Sep. 1976, pp. 10-12.

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