GAS-PHASE FLUIDIZED-BED REACTOR, MULTIVESSEL POLYMERIZATION REACTOR AND PROCESS FOR PRODUCING OLEFIN POLYMER

摘要

A gas-phase fluidized-bed reactor adapted to in a reaction vessel, cause a gas to flow from a gas dispersion plate disposed thereunder into a fluid layer provided above the gas dispersion plate to thereby carry out a reaction, characterized in that the reaction vessel is so constructed that a gas flow channel above the gas dispersion plate has a narrow portion at given position, and that the reaction vessel is used while forming a fluid layer from below the narrow portion to above the same. In the use of this gas-phase fluidized-bed reactor, at gas-phase polymerization, it becomes feasible to produce a polymer excelling in the uniformity of polymer structure.