DIRECT CONVERSION OF CATALYTIC POLYMERIZATION REACTION BY ZIEGLER CATALYST TO CATALYTIC POLYMERIZATION REACTION BY CHROMIUM-BASE CATALYST

摘要

A method of converting a continuous olefin polymerization reaction catalyzed by a Ziegler-type catalyst into one catalyzed by a chromium- based catalyst, without the need of emptying and recharging the polymerization reactor, by adding a hydroxyl-containing compound to the reactor containing the Ziegler-type catalyst to interact with such catalyst before the chromium-based catalyst is introduced into the reactor.