Large-scale aggregation still for vinyl chloride suspension polymerization

The utility model discloses a large-scale aggregation kettle for vinyl chloride suspension polymerization, comprising a kettle body, a driving device, a stirrer which is arranged in the kettle body, and a polymerization reaction DOS control system. The driving device comprises an electric machine, a torque converter and a speed reducer. The utility model is characterized in that the outer wall of the straight canister section of the kettle body is fixedly provided with a helical semi-tube and the outer wall of the bottom of the kettle body is also fixed with a helical semi-tube; a condenser is arranged on the top part of the kettle body, an inner-cooling sleeve tube whose lower part is extended out of the kettle body is arranged in the kettle body, and a water inlet and a water outlet are arranged on the kettle body. The utility model has the advantages of suitable stirring intension shear stress and cyclic times, concentrated and uniform product particles, stable transmission, long running period and favorable heat transferring effect. The utility model can obtain high quality polyvinyl chloride products with good particle shape, uniform molecular weight distribution, higher oil adsorption ratio and few black and yellow points and eutectic points, and the continuous production has no need of defecation kettle.