| abstract |
(57) [Summary] [PROBLEMS] To suppress the formation of lumps and agglomerates and the adhesion of a polymer to the polymerization tank wall and stirring blades, without clogging of pipes, stable continuous production is possible, and the quality is reduced. Of a polyolefin-free production method. SOLUTION: In a method for producing a polyolefin by continuous gas phase polymerization using an olefin polymerization catalyst, a catalyst activity inhibitor is supplied to a polymerization tank powder part from a polymerization tank gas phase part and a side wall of the polymerization tank. Is a method for producing a polyolefin. The catalyst activity inhibitor is, for example, at least one of A, which is a gas phase part, and B, C, and D which are powder parts in the figure. Supplied from two or more locations. Alcohols are used as the catalyst activity inhibitor. |