| 摘要 |
<p>The polymerization apparatus comprises a generally cylindrical polymerization vessel (1) having a straight cylindrical section, cooling means (2,3) for cooling the content of the polymerization vessel, and paddle impellers (5), each having impeller blades (6), for agitating the content inside the polymerization vessel by being rotated on a center line (A), as a shaft, of the cylindrical section of the polymerization vessel (1), wherein the polymerization vessel (1) has an inner capacity of 100 m<3> or more and has 1.5 or more in a ratio L/D of the length L of the cylindrical section to the inner diameter D of the vessel, wherein three or more of the blade impellers (6) are arranged on and along said center line (A), and wherein polymerization-inhibitor charge openings (7) are arranged at predetermined positions on the interior surface of the polymerization vessel (1) in such a manner that each of said predetermined positions substantially corresponds to the center line (C) of each blade impeller. The method for stopping polymerization comprises using said polymerization apparatus and charging a polymerization inhibitor into the polymerization apparatus through its polymerization- inhibitor charge openings (7) during polymerization of a vinyl chloride monomer or a mixture of monomers containing the vinyl chloride monomer as a primary component. According to the invention, after a polymerization inhibitor was charged into the polymerization vessel, the inhibitor can be rapidly diffused therein, so that the polymerization reaction can be rapidly and completely stopped by a smaller amount of the inhibitor even when an abnormal reaction occurred in the vessel.</p> |
