Slurry polymerization process

摘要

An improvement in a process for the copolymerization of ethylene and an alpha -olefin having 3 to 18 carbon atoms and optionally also a nonconjugated diene having only one readily polymerizable double bond in the presence of a catalyst and a liquid organic medium to an elastomeric copolymer insoluble in the liquid polymerization medium, having a portion of said medium occluded therein, and tending to agglomerate on solid surfaces, wherein simultaneously and continuously A. THE AGGLOMERATED COPOLYMER ADHERING TO THE INTERIOR SURFACES OF THE POLYMERIZATION VESSEL IS REMOVED WITH A WALL SCRAPER WHICH IS BEING CLEANED BY A CLEANING MEMBER ASSOCIATED THEREWITH; B. THE AGGLOMERATED COPOLYMER IS COLLECTED; AND C. THE COLLECTED AGGLOMERATED COPOLYMER IS CONCURRENTLY SHEARED AND EXTRUDED, WHEREBY THE OCCLUDED LIQUID POLYMERIZATION MEDIUM IS SEPARATED FROM THE COPOLYMER AND REMAINS IN THE POLYMERIZATION VESSEL, WHILE THE COPOLYMER IS DISCHARGED FROM SAID VESSEL.