Reaction apparatus

A reaction apparatus comprising:

• a cylindrical reaction vessel including an intermediate part between a supply part and a delivery part;
• a temperature control unit configured to control a temperature of the intermediate part;
• the supply part configured to supply a substance to be treated to the reaction vessel and the delivery part configured to deliver a product from the reaction vessel;
• a conveyance mechanism configured to convey the substance to be treated from a side of the reaction vessel close to the supply part to a side of the reaction vessel close to the delivery part through the intermediate part;
• a first support part configured to support one end side of the reaction vessel in a state in which the one end side of the reaction vessel is fixed;
• and
• a second support part configured to support another end side of the reaction vessel in such a way that the other end side of the reaction vessel is movable in an axial direction of the reaction vessel, wherein
• the temperature control unit controls a temperature increase rate or a temperature decrease rate of the intermediate part in such a way that an actual displacement rate of a specific part of the reaction vessel follows a desirable displacement rate of the specific part of the reaction vessel.