Reactor

A reactor comprising:

• a first flow channel through which a reaction fluid flows;
• a second flow channel through which a heat medium flows, the second flow channel being stacked parallel to the first flow channel;
• an introduction port open in a direction intersecting with the second flow channel to introduce the heat medium;
• a catalyst body provided in the first flow channel to promote an exothermic reaction of the reaction fluid;
• and
• a fourth flow channel through which a refrigerant flows,
• wherein, when
• a first reference position is presumed to be defined by a straight line in contact with a first open end of the introduction port on a side bent toward the second flow channel and extending in the direction intersecting with the second flow channel, and
• a second reference position is presumed to be defined by a straight line in contact with a second open end of the introduction port on an opposite side of the first open end and extending in the direction intersecting with the second flow channel,
• at least part of the catalyst body is provided at least either in a region defined between the first reference position and the second reference position, or in a region defined between the second reference position and an inlet position of the first flow channel,
• and
• the fourth flow channel is stacked parallel to the first flow channel, has one end communicating with an introduction port from which the refrigerant is introduced, and has another end communicating in line with the second flow channel on an introduction side of the heat medium at a position of the straight line defining the second reference position.

A reactor comprising:

• a first flow channel through which a reaction fluid flows;
• a second flow channel through which a heat medium flows, the second flow channel being stacked parallel to the first flow channel;
• an introduction port open in a direction intersecting with the second flow channel to introduce the heat medium;
• and
• a catalyst body provided in the first flow channel to promote an exothermic reaction of the reaction fluid,
• wherein:
• when
• a first reference position is presumed to be defined by a straight line in contact with a first open end of the introduction port on a side bent toward the second flow channel and extending in the direction intersecting with the second flow channel, and
• a second reference position is presumed to be defined by a straight line in contact with a second open end of the introduction port on an opposite side of the first open end and extending in the direction intersecting with the second flow channel,
• at least part of the catalyst body is provided at least either in a region defined between the first reference position and the second reference position, or in a region defined between the second reference position and an inlet position of the first flow channel;
• the catalyst body comprises a plurality of catalyst bodies provided in the first flow channel;
• at least one of the catalyst bodies is provided in a region on one side based on the first reference position;
• and
• at least another one of the catalyst bodies is provided in a region on another side based on the first reference position.