Method of producing oils and fats and oil- and fat- producing apparatus

An oil production apparatus comprising:

• a reaction vessel including an inlet port through which raw material composed of an agricultural residue or a fishery residue is fed and an outlet port through which a product is taken out;
• a water vapor injecting unit for injecting saturated water vapor into the reaction vessel in which the raw material has been fed;
• a kneading unit for kneading a content in the reaction vessel;
• a temperature sensor disposed at a lower part of the reaction vessel;
• a pressure regulating unit for regulating pressure in the reaction vessel;
• a control unit for controlling driving of the water vapor injecting unit, the kneading unit, and the pressure regulating unit based on temperature measured by the temperature sensor or pressure regulated by the pressure regulating unit;
• a housing for making a working area in an oxygen-free condition, the area in which a process from taking out of the product in the reaction vessel from the outlet port to extraction of the oil is performed;
• a solid-liquid separating unit provided in the housing for separating solid from the product;
• a water removing unit provided in the housing for removing water from a liquid after separating the solid by the solid-liquid separating unit;
• and
• a nitrogen injecting device for injecting nitrogen into the housing.