Process and apparatus for the gas-phase polymerization of .alpha.-olefins
First Claim
1. Process for the gas-phase polymerization of α
- -olefins CH2 ═
CHR, where R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, carried out in a first and in a second interconnected polymerization zones, to which one or more of said α
-olefins are fed in the presence of a catalyst under reaction conditions and from which the polymer product is discharged, wherein the growing polymer particles flow through the first of said polymerization zones under fast fluidization conditions, leave said first polymerization zone and enter the second of said polymerization zones through which they flow in a densified form under the action of gravity, leave said second polymerization zone and are reintroduced into said first polymerization zone, thus establishing a circulation of polymer between the two polymerization zones.
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Abstract
Process for gas-phase polymerization carried out in two interconnected polymerization zones, to which one or more α-olefins CH2 ═CHR are fed in the presence of catalyst under reaction conditions and from which the polymer product is discharged. The process is characterized in that the growing polymer flows through a first polymerization zone under fast fluidization conditions, leaves said first zone and enters a second polymerization zone through which it flows in a densified form under the action of gravity, leaves said second zone and is reintroduced into the first polymerization zone, thus establishing a circulation of polymer around the two polymerization zones. The novel process allows olefins to be polymerized in the gas phase with high productivity per unit volume of the reactor without incurring the problems of the fluidized-bed technologies of the known state of the art.
129 Citations
23 Claims
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1. Process for the gas-phase polymerization of α
- -olefins CH2 ═
CHR, where R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, carried out in a first and in a second interconnected polymerization zones, to which one or more of said α
-olefins are fed in the presence of a catalyst under reaction conditions and from which the polymer product is discharged, wherein the growing polymer particles flow through the first of said polymerization zones under fast fluidization conditions, leave said first polymerization zone and enter the second of said polymerization zones through which they flow in a densified form under the action of gravity, leave said second polymerization zone and are reintroduced into said first polymerization zone, thus establishing a circulation of polymer between the two polymerization zones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- -olefins CH2 ═
Specification