DIRECT CONVERSION OF A POLYMERIZATION REACTION CATALYZED BY A ZIEGLER-TYPE CATALYST INTO ONE CATALYZED BY A CHROMIUM-BASED 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. D-12,981-1