Fresh feed of C.sub.1 -C.sub.5 refinery gases containing predominantly polymerizable butenes are rapidly mixed and diluted with Friedel-Crafts catalyst and recycle reaction mixture in a static mixer before passing to the polymerization reaction column whereby the temperature is more readily controlled...http://www.google.fr/patents/US3991129?utm_source=gb-gplus-shareBrevet US3991129 - Production of polybutene with static mixer
