Patent ID: 8563669

Claim:
A polyolefin production process for performing polymerization of olefin using the olefin polymerization reactor comprising: a first cylinder which extends vertically; a first tapered cylindrical member which is placed in the first cylinder, which decreases in inner diameter progressively downward, and which has a gas inlet orifice at a bottom end thereof; a first liquid supplying part which supplies a liquid so that the liquid may come into contact with an outer surface of the first tapered cylindrical member; and a gas supplying part which supplies an olefin-containing gas through the gas inlet orifice into a first reaction region surrounded by an inner surface of the first tapered cylindrical member and an inner surface of the first cylinder above the first tapered cylindrical member, to form a spouted bed in the first reaction region, wherein the process comprising: a step of forming a spouted bed of polyolefin particles in the first reaction region; and a step of supplying a liquid so that the liquid may come into contact with the outer surface of the first tapered cylindrical member.