Reactor apparatus, vinyl-based polymer manufacturing method, and method for producing vinyl-based polymer

A reactor apparatus of batch type used for producing a polymer by suspension polymerization using a dispersing aid, the reactor apparatus comprising:

• a reactor having a straight body having a tubular shape;
• a plurality of first cooling pipes arranged inside the reactor, for circulating a coolant;
• an agitation shaft which is arranged inside the reactor, is attached with one or more agitating blades, and configured to be rotatable;
• and
• a dispersing aid input unit which inputs the dispersing aid into the reactor, wherein
• a representative point of each of the plurality of first cooling pipes in a plane substantially perpendicular to an extending direction of the straight body is located substantially on a circumference of any of a plurality of virtual circles arranged substantially concentrically in the substantially perpendicular plane, and
• when a number Nc [units] of the plurality of virtual circles is 1, 2, or 3, the dispersing aid input unit inputs the dispersing aid so that the number Nc [units] of the plurality of virtual circles and a proportion CZ [mg-dispersing aid/kg-monomer] of a mass of the dispersing aid to a mass of one or more types of monomers to be materials of the polymer satisfy a relationship represented by following Expression A1
• 15Nc+300<CZ<175Nc+2000. (Expression A1)

A method for producing a vinyl-based polymer by a suspension polymerization method by using a reactor apparatus of batch type, wherein

• the reactor apparatus includes
• a reactor having a straight body having a tubular shape,
• a plurality of first cooling pipes arranged inside the reactor, for circulating a coolant, and
• an agitation shaft which is arranged inside the reactor, is attached with an agitating blade, and is configured to be rotatable, wherein
• a representative point of each of the plurality of first cooling pipes in a plane substantially perpendicular to an extending direction of the straight body is located substantially on a circumference of any of a plurality of virtual circles arranged substantially concentrically in the substantially perpendicular plane, and
• the method comprising:
• inputting a material by inputting a vinyl-based monomer, an aqueous media, and a dispersing aid into the reactor;
• and
• polymerizing the vinyl-based monomer to produce a vinyl-based polymer, wherein
• the inputting the material includes
• inputting the dispersing aid such that when a number Nc [units] of the plurality of virtual circles is 1, 2, or 3, the number Nc [units] of the plurality of virtual circles and a proportion CZ [mg-dispersing aid/kg-monomer] of a mass of the dispersing aid to a mass of the vinyl-based monomer satisfy a relationship represented by following Expression A1
• 15Nc+300<CZ<175Nc+2000. (Expression A1)