Process for polymerising olefin in gas phase

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

1997-01-15

1998-08-04

Wu, David W.

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

Synthetic resins

Removing and recycling removed material from an ongoing...

526 69, 528483, 528499, C08F 600

Patent

active

057895015

ABSTRACT:
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-)monomers(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 whiteness index and a long thermal stability with time.

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patent: 4258158 (1981-03-01), Pfeiffer
patent: 4314053 (1982-02-01), Lin et al.
patent: 4372758 (1983-02-01), Bobst et al.
patent: 4758654 (1988-07-01), Brod et al.
patent: 5071950 (1991-12-01), Borho et al.

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