Process for polymerising olefin in gas phase

Details Process for polymerising olefin in gas phase Process for polymerising olefin in gas phase

C - Chemistry, Metallurgy

08

F

C08F 2/34 (2006.01) C08F 6/00 (2006.01) C08F 6/02 (2006.01) C08F 10/02 (2006.01)

Patent

CA 2149374

The present invention relates to a process for continuously manufacturing ethylene (co-)polymer in a gaseous phase in a polymerization zone through which passes an essentially gaseous reaction mixture comprising the (co-)monomer(s). In addition the process comprises transferring a mixture (A) formed by the gaseous reaction mixture and the solid (co-)polymer in a depressurization zone, and separating the mixture (A) into a solid phase (B) and a gaseous phase (C) returned into the polymerization zone. The solid phase (B) is subjected to (1) at least one non-deactivating flushing with respect to the active catalytic residues, and subsequently (2) a deactivating flushing with a gaseous mixture of nitrogen, water and oxygen . The (co-)polymer thus obtained has very low contents of unreacted (co-)monomer(s) and volatile organic compounds, and exhibits a high whiteners index and a long thermal stability with time.

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