System for producing polyolefin, method of producing polyolefin, and method of producing heterophasic propylene polymer material

Abstract

Provided are a system for producing a polyolefin, a method of producing a polyolefin, and a method of producing a heterophasic propylene polymer material, each of which allows (i) a gel, to be contained in a molded product that is made of an obtained polyolefin, to be reduced and (ii) a polyolefin to be continuously produced stably. A polyolefin producing system () includes: a cylindrical member which extends in a vertical direction; diameter decreasing members each of which is provided to the cylindrical member, each of the diameter decreasing members having (i) an inner diameter that decreases as the each of the diameter decreasing members extends downward and (ii) a gas inlet opening at a lower end of the each of the diameter decreasing members; spouted bed type olefin polymerization reaction regions () each of which is surrounded by (a) an inner surface of a corresponding one of the diameter decreasing members and (b) part of an inner surface of the cylindrical member which part extends upward from the corresponding one of the diameter decreasing members, each of the spouted bed type olefin polymerization reaction regions () being a region in which a spouted bed is formed, the number of the spouted bed type olefin polymerization reaction regions () being 3 or more; and at least one fluidized bed type olefin polymerization reaction region which is provided at a stage subsequent to the spouted bed type olefin polymerization reaction regions ().