Patent ID: 6458900
Filing Date: 2002-10-01
Classification: B01D,B01J,C01B,C08F,Y10S

Abstract:
A process for the production of polyolefins in a reactor system, which comprises at least two reactor units, wherein at least one of the reactors is a gas phase reactor (B), in which at least one monomer is polymerized,said process comprising directing effluent of reactor unit (A) in a first stream into the at least one gas phase reactor (B), subjecting the effluent to a phase change by lowering the pressure of the effluent by at least 1 bar, whereby a liquid, if present containing unreacted light hydrocarbons and hydrogen is partly vaporized out from the effluent in a vaporization step in a first vaporizer to form an unvaporized liquid portion and a gas portion containing light hydrocarbons and hydrogen, and separating hydrogen from said gas portion by membrane separation in a hydrogen separation step to form a stream comprising hydrogen and a second stream containing reduced hydrogen content.