NOVELTY - The apparatus has horizontal discs (31,32) that are arranged at predefined intervals along the length direction of a rotating shaft (26) arranged inside a reaction container (11). The stirring vanes (33) are arranged on the upper surface of the horizontal discs. A predefined gap is formed between the outer peripheral surface of the horizontal disc (32) and inner peripheral surface of cylindrical wall (21) of the reaction container, for circulating reaction material. A reaction material distribution path (34) is formed in the inner surface of the disc (31).    USE - Stirring apparatus for use in ester degradation reaction of waste edible oil used in manufacturing process of biodiesel fuel.    ADVANTAGE - The inner side of the reaction container can be divided into multiple chambers and manufacturing cost of the stirring apparatus can be reduced by using a simple arrangement.    DETAILED DESCRIPTION - The stirring apparatus has horizontal discs that are arranged at predefined intervals along the length direction of a rotating shaft arranged inside a reaction container. An annular groove is formed in the outer peripheral surface of the horizontal disc (32). Several protrusions are formed in the lower surface of the outer edge of the horizontal disc (32) at predefined intervals. The corrugations are formed on the outer periphery of the horizontal disc (32). The area of the reaction material distribution path formed in the inner surface of the horizontal disc (31) is equal to the thickness of gap formed between the outer peripheral surface of the horizontal disc (32) and inner peripheral surface of cylindrical wall of the reaction container. The gap formed between the outer peripheral surface of the horizontal disc (31) and inner peripheral surface of cylindrical wall of the reaction container is in fixed level, for blocking circulation of the reaction material.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the stirring apparatus.    Reaction container (11)    Cylindrical wall (21)    Rotating shaft (26)    Horizontal discs (31,32)    Stirring vanes (33)    Reaction material distribution path (34)