CONTINUOUS VAPOR-PHASE POLYMERIZATION AND USAGE OF CATALYST POISON THEREIN

摘要

PROBLEM TO BE SOLVED: To avoid the production of a polymer deposit in a circulating gas line and carry out the continuous vapor-phase polymerization by polymerizing a mixture of ethylene and/or propene with a specific olefin under specific conditions. SOLUTION: A catalyst poison having a higher boiling point than the maximum temperature in a circulating gas line in an amount so as not to cause a great loss in the productivity of the catalyst in a vapor-phase polymerization reactor is metered and fed to the circulating gas line when carrying out the continuous vapor phase polymerization of a mixture of ethylene and/or propene with a C3 -C8 -α-monoolefin in the presence of a catalyst in the vapor phase in a finely dispersed polymeric bed in the vapor-phase polymerization reactor under conditions of 30-125 deg.C and 1-100 bar while removing heat of polymerization by circulating a reactor gas. One or more kinds of compounds having a functional group selected from NR2 , NR, OR, O, =O, OS, S and =S (R is H or a 1-8C alkyl) are preferably used as the catalyst poison.