METHOD FOR TRANSITIONING BETWEEN ZIEGLER-NATTA AND METALLOCENE CATALYSTS IN BULK LOOP REACTOR FOR PRODUCTION OF POLYPROPYLENE

摘要

PURPOSE: A method for polymerizing propylene in a bulk loop reactor, a method for contacting a metallocene flow with a propylene flow and a method for introducing an antifouling agent into a bulk loop reactor are provided, to produce commercial amount of polypropylene by transitioning between Ziegler-Natta and metallocene catalysts in a bulk loop reactor. CONSTITUTION: The polymerization method of propylene in a bulk loop reactor having a first temperature range comprises the steps of introducing a certain quantity of a metallocene catalyst having a second temperature range from a first catalyst mixing system connected with a bulk loop reactor into the bulk loop reactor with a first frequency; and introducing a certain quantity of a Ziegler-Natta catalyst having a third temperature range from a second catalyst mixing system connected with the bulk loop reactor into the bulk loop reactor with a second frequency. Preferably the first frequency is hither than the second frequency, and the first temperature range is higher than the second temperature range.