Reactor

1. A manufacturing method for a reaction product comprising:

housing a polymerization solution in a reaction vessel in which a polymerization reaction is performed;

stirring the polymerization solution housed in the reaction vessel using a stirring blade;

transferring heat to the polymerization solution in order to start the polymerization reaction and cause the polymerization reaction to proceed, and to remove, from the polymerization solution, heat generated by the polymerization reaction using a plurality of heat transfer pipes, elongated to a depth direction of the vessel; wherein

the plurality of heat transfer pipes are arranged in a circumferential shape around the stirring blade, include a heat transfer pipe whose lower end is arranged in a position higher than a bottom face of the reaction vessel, and restrict an amount of the polymerization solution circulated from an inner side to a vessel wall side of the reaction vessel, at a depth at which the heat transfer pipes are arranged,

the polymerization solution is housed in the reaction vessel such that upper ends of the plurality of heat transfer pipes are arranged in positions lower than a liquid surface of the polymerization solution,

the method further comprising changing a flow direction of the polymerization solution that has flowed between the vessel wall of the reaction vessel and the heat transfer pipes arranged in the circumferential shape using a baffle arranged between a vessel wall of the reaction vessel and the heat transfer pipes, thereby generating a flow of the polymerization solution to an inward direction of the reaction vessel, and wherein

the polymerization solution immerses the baffle such that a length of a section of the baffle immersed in the polymerization solution is from 10% to 50% of a liquid level.

2. The manufacturing method for a reaction product according to claim 1 , wherein

the baffle comprises a plurality of the baffles arranged so as to protrude from the vessel wall of the reaction vessel in the inward direction of the reaction vessel, and

the changing the flow direction comprises changing the flow direction of the polymerization solution that rises while revolving along the vessel wall of the reaction vessel using the plurality of the baffles.

3. The manufacturing method for a reaction product according to claim 1 , wherein

the polymerization solution immerses the baffle such that an upper end of the baffle is higher than a position of a liquid surface and a lower end of the baffle is at a position lower than a position of the liquid surface.

4. The manufacturing method for a reaction product according to claim 1 , wherein

the polymerization solution immerses the plurality of heat transfer pipes such that upper ends of the plurality of heat transfer pipes are at positions lower than a position of a liquid surface.

5. The manufacturing method for a reaction product according to claim 1 , wherein

a distance between lower ends of the plurality of heat transfer pipes and the bottom face of the reaction vessel is longer than a distance between the plurality of heat transfer pipes and the vessel wall of the reaction vessel.

6. The manufacturing method for a reaction product according to claim 1 , wherein

the plurality of heat transfer pipes have a hairpin coil shape in which ends of two pipes that are arranged in a vertical direction are coupled together.

7. The manufacturing method for a reaction product according to claim 6 , wherein

the plurality of heat transfer pipes having the hairpin coil shape are arranged in positions in which distances and angles from a center axis of the reaction vessel to each of the two pipes are different.

8. The manufacturing method for a reaction product according to claim 1 , wherein

the polymerization solution contains one of a raw material of polyarylene sulfide and polyarylene sulfide produced from the raw material.