Reactor system for suspension polymerisation of vinyl chloride.

摘要

An improvement is proposed in a polymerization reactor system for the suspension polymerization of vinyl chloride monomer comprising a reactor (1) and an external heat exchanger (2) connected to the reactor (1) by a pipe line (3) through a pumping means (4) in order to supplement the deficiency in the cooling capacity of the jacket of (6) the reactor and/or reflux condenser installed thereto when the capacity of the reactor is greatly increased. While such an external circulating circuit using a conventional pump suffers from a serious problem of polymer scale deposition on the inner walls of the circuit and degradation of the quality of the resin product, these drawbacks can be dissolved by using a specific pump having an impellor (16) in the form of a single spiral screw blade around a hub (15) having a conical configuration for the circulation of the polymerization mixture through the heat exchanger.