Reactor apparatus, vinyl-based polymer manufacturing method, control apparatus, and agitation apparatus

A vinyl-based polymer manufacturing method, comprising producing a vinyl-based polymer by polymerizing a vinyl-based monomer by using a reactor apparatus, wherein

• the reactor apparatus includes
• a reactor having a straight body having a tubular shape,
• an agitation shaft one part of which is arranged inside the straight body and which is configured to be rotatable, and
• a plurality of agitating blades attached to different positions in an extending direction of the agitation shaft,
• the producing the vinyl-based polymer includes
• controlling a number of rotations of the agitation shaft so that the number of rotations of the agitation shaft satisfies a relationship represented by following Expression 1
• N(b/d)(L/D)/n≤6.0 (Expression 1)
• (in Expression 1,
• N represents a number of the plurality of agitating blades,
• b represents a maximum value [m] of blade widths of the plurality of agitating blades,
• d represents a maximum value [m] of blade diameters of the plurality of agitating blades,
• L represents a length [m] of the straight body in an extending direction,
• when the straight body is cut along a plurality of planes substantially perpendicular to the extending direction of the straight body and passing through respective attachment positions of the plurality of agitating blades, D represents a maximum value [m] of diameters of a plurality of inscribed circles substantially inscribed in the straight body in respective cross sections taken along the plurality of planes, and
• n is a set value of the number of rotations [rps] of the agitation shaft.).

A control apparatus which controls a number of rotations of an agitation shaft which is rotatably arranged inside a reactor and to which a plurality of agitating blades are attached, wherein

• the reactor has a straight body having a tubular shape,
• one part of the agitation shaft is arranged inside the straight body, and
• the control apparatus controls the number of rotations of the agitation shaft so that the number of rotations of the agitation shaft satisfies a relationship represented by following Expression 1
• N(b/d)(L/D)/n≤6.0 (Expression 1)
• (in Expression 1,
• N represents a number of the plurality of agitating blades,
• b represents a maximum value [m] of blade widths of the plurality of agitating blades,
• d represents a maximum value [m] of blade diameters of the plurality of agitating blades,
• L represents a length [m] of the straight body in an extending direction,
• when the straight body is cut along a plurality of planes substantially perpendicular to the extending direction of the straight body and passing through respective attachment positions of the plurality of agitating blades, D represents a maximum value [m] of diameters of a plurality of inscribed circles substantially inscribed in the straight body in respective cross sections taken along the plurality of planes, and
• n is a set value of the number of rotations [rps] of the agitation shaft.).