Process for the gas-phase polymerization of olefins

Details Process for the gas-phase polymerization of olefins Process for the gas-phase polymerization of olefins

C - Chemistry, Metallurgy

08

F

C08F 10/00 (2006.01) B01J 8/18 (2006.01) B01J 8/20 (2006.01) C08F 2/00 (2006.01) C08F 2/01 (2006.01) C08F 2/34 (2006.01)

Patent

CA 2608318

A process for the gas-phase polymerization of .alpha.-olefÊns CH2=CHR, where R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, carried out in a first and a second interconnected polymerization zones, wherein the growing polymer particles flow through the first of said polymerization zones (riser) under fast fluidization conditions, leave said riser and enter the second of said polymerization zones (downcomer) through which they flow downward in a densified form, leave said downcomer and are reintroduced into said riser, in which process: (a) the gas mixture present in the riser is totally or partially prevented from entering the downcomer, and (b) the gaseous composition inside a portion of the downcomer is maintained substantially similar to the gaseous composition reacting in the riser.

Procédé pour la polymérisation en phase gazeuse d'.alpha.-oléfines CH2=CHR, R étant un hydrogène ou un radical hydrocarboné ayant 1-12 atomes de carbone, effectué dans une première zone de polymérisation et une seconde zone de polymérisation communicantes, dans lequel les particules de polymère en croissance circulent dans la première desdites zones de polymérisation (colonne montante) dans des conditions de fluidisation rapide, quittent ladite colonne montante et entrent dans la seconde desdites zones de polymérisation (colonne descendante) dans laquelle elles circulent vers le bas sous une forme densifiée, quittent ladite colonne descendante et sont réintroduites dans ladite colonne montante, procédé dans lequel: (a) on empêche complètement ou partiellement le mélange gazeux présent dans la colonne montante d'entrer dans la colonne descendante et (b) on maintient une composition gazeuse à l'intérieur d'une partie de la colonne descendante pratiquement similaire à la composition gazeuse réagissant dans la colonne montante.

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