Method for producing particles and particle production apparatus

A particle production apparatus comprising:

• a first flow path through which a reaction raw material liquid including at least a raw material for particle formation and a solvent dissolving the raw material for particle formation is sent;
• a segmented flow formation section provided in a downstream side of the first flow path and forming a segmented reaction raw material liquid flow in which the reaction raw material liquid is divided into segments by a gas for segmentation by introducing the gas for segmentation into the reaction raw material liquid;
• a second flow path provided in a downstream side of the segmented flow formation section and forming a product particle flow including target product particles by sending the segmented reaction raw material liquid flow and reacting the raw material for particle formation to generate the target product particles;
• a heating section provided on an outer circumference side of the second flow path and heating the segmented reaction raw material liquid flow in the second flow path;
• and
• a pressure control section controlling pressure of the segmented reaction raw material liquid flow in the second flow path, wherein
• a volume ratio of the reaction raw material liquid and the gas for segmentation forming the segmented reaction raw material liquid flow, pressure P1 of the segmented reaction raw material liquid flow, and heating temperature T of the segmented reaction raw material liquid flow are controlled by the segmented flow formation section, the heating section, and the pressure control section so that the pressure of the segmented reaction raw material liquid flow flowing through the second flow path is P1 (MPa), the heating temperature of the segmented reaction raw material liquid flow is T (° C.), a ratio (Vd/Vc) of a volume Vd (mL) of the gas for segmentation to a volume Vc (mL) of the reaction raw material liquid in the segmented reaction raw material liquid flow is 0.200 to 7.00, and the pressure P1 is 2.0 times or more a vapor pressure P2 (MPa) of the solvent at the heating temperature T.