Continuous polymerization reactor for super absorbent polymer and continuous polymerization reaction system

A continuous polymerization reaction system comprising:

• a first vessel in which water soluble ethylenically unsaturated monomers having acid groups, a solvent, and an internal crosslinking agent are stored;
• a second vessel in which a part of a polymerization initiator is stored;
• a third vessel in which remaining part of the polymerization initiator is stored;
• a continuous polymerization reactor including an inlet located at an upper part of the continuous polymerization reactor, through which a monomer composition including the water soluble ethylenically unsaturated monomers having acid groups, the solvent, the internal crosslinking agent and the polymerization initiator is introduced, and an outlet located at a lower part of the continuous polymerization reactor, through which hydrogel super absorbent polymer formed by polymerization of the monomer composition is discharged;
• a feed pipe connected to the inlet so as to introduce the monomer composition;
• a first feed valve connecting the first vessel with the feed pipe;
• a second feed valve connecting the second vessel with the feed pipe;
• a third feed valve connecting the third vessel with the feed pipe;
• a discharge valve for opening or closing the outlet;
• and
• a controller for controlling operations of the first, second, and third feed valves and the discharge valve;
• wherein the controller controls the first, second, and third feed valves such that the monomer composition is continuously introduced through the inlet with a predetermined flow rate, and controls the discharge valve such that the hydrogel super absorbent polymer is continuously discharged with the same flow rate as the predetermined flow rate.