Patent ID: 8084555
Filing Date: 2011-12-27
Classification: B01J,C08F

Abstract:
1. A polyolefin production process comprising a step of: carrying out olefin polymerization by using a spouted bed device to form a spouted bed of polyolefin particles, wherein the spout bed device comprises: a vertically extending cylinder; a decreasing diameter member which is formed on the cylinder, has an inside diameter that decreases progressively downward, and has a gas inlet orifice at a bottom end thereof; a tubular portion which extends downward from an edge of the gas inlet orifice; and a conical baffle of a first type which has an outside diameter that increases progressively downward, is closed at a top end thereof, and has a bottom end that is spaced apart from an inside wall of the cylinder, wherein the conical baffle of the first type is disposed at a position which is below and opposite a bottom end of the tubular portion.