Preparation of propylene homopolymers or copolymers

Details Preparation of propylene homopolymers or copolymers Preparation of propylene homopolymers or copolymers

1981-03-31

1982-05-18

Smmith, Edward J.

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

Synthetic resins

Effecting a change in a polymerization process in response...

526 68, 526 88, 526901, C08F 234, C08F 1006

Patent

active

043306454

ABSTRACT:
A process for the preparation of propylene homopolymers or copolymers by polymerizing the monomer or monomers in the gas phase in a centric stirred bed of finely divided polymer, with removal of the heat of polymerization by evaporative cooling, the temperature in the polymerization zone being regulated by measuring the temperature continuously and causing any change therein to trigger a change in the amount of liquid monomer, evaporating in the reaction zone, which is introduced per unit time, in which process
(1) the radius and height of the centric stirred bed are in a particular ratio to one another, (2) the finely divided polymer in the centric stirred bed is caused to move upward in the peripheral zone of the bed and downward in the central zone of the bed, (3) the temperature in the polymerization zone is regulated by simultaneously measuring it at (3.1) one or more points of the inner part of the stirred bed and (3.2) one or more points of the outer part of the stirred bed and (4) the actual temperatures T determined simultaneously at the individual points of measurement are combined to give a temperature parameter T.sub.M and the difference of this parameter from the intended value triggers the regulating sequence, or the temperature differences .DELTA.T between the actual and intended temperatures, measured simultaneously at the individual points of measurement, are combined to give a difference parameter .DELTA.T.sub.M and this parameter triggers the regulating operation.

REFERENCES:
patent: 3944534 (1976-03-01), Sennari et al.
patent: 4012573 (1977-03-01), Trieschmann et al.
patent: 4061848 (1977-12-01), Sistig et al.
patent: 4129701 (1978-12-01), Segl et al.

Affiliated with

Also associated with

Rating

Preparation of propylene homopolymers or copolymers does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Preparation of propylene homopolymers or copolymers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of propylene homopolymers or copolymers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-487534