Flow reactor

A flow reactor configured such that a cylindrical inner heat transfer body is served as an external thread portion, a cylindrical outer heat transfer body is served as an internal thread portion, the inner and outer heat transfer bodies are assembled into a thread shape;

• a space between the inner heat transfer body and the outer heat transfer body is served as a first flow path through which a first fluid flows;
• a second flow path provided in an inner side of the inner heat transfer body and a third flow path provided in an outer side of the outer heat transfer body are arranged;
• a heat exchange is performed between a second fluid flowing through the second flow path and the first fluid via the inner heat transfer body;
• and a heat exchange is performed between a third fluid flowing through the third flow path and the first fluid via the outer heat transfer body, wherein
• the flow reactor includes an inner tube and an outer tube,
• the cylindrical inner heat transfer body and the cylindrical outer heat transfer body are disposed in a gap formed between the inner tube and the outer tube,
• a first distance between a peak portion of the cylindrical inner heat transfer body and a valley portion of the cylindrical outer heat transfer body in a radial direction defines a maximum flow path width of the first flow path, and a second distance between a valley portion of the cylindrical inner heat transfer body and a peak portion of the cylindrical outer heat transfer body in the radial direction defines a minimum flow path width of the first flow path, the minimum flow path width being smaller than the maximum flow path width,
• the first flow path is a flow path that spirally circulates,
• a ratio (α/β) of the maximum flow path width (α) of the first flow path to the minimum flow path width (β) of the first flow path in a radius direction is 2 or more (2<α/β<∞), and
• a first angle formed by the peak portion of the cylindrical inner heat transfer body is larger than a second angle formed by the valley portion of the cylindrical outer heat transfer body.