NOVELTY - An apparatus and a method for preparing alternative fuels using waste edible oils through a high performance facility in separation and purification processes are provided to secure economic efficiency by simplifying the preparation process and maximizing treatment capacities per processes, thereby maximizing the output, and solve environmental problems by preventing wastewater from being discharged.    DETAILED DESCRIPTION - An apparatus for preparing an alternative fuel using waste edible oils and the like comprises: a reactor(1) having an agitator(103) and an agitation motor(102); a methanol storage tank(15), a waste edible oil storage tank(16), a catalyst storage tank(17) and the steam supply tank respectively connected to the reactor by connection pipes; a condenser(6) for recovering vaporized methanol from the reactor and condensing methanol gas recovered from the gas-liquid separator; a heat exchanger(2) for heat exchanging a mixed solution transferred from a lower part of the reactor by a pipe; a steam supply tank(18) for supplying heat to the heat exchanger; blocking plates(21) vertically formed in a zigzag shape in the heat exchanger; a heat exchange recovery part(7) installed on a lower part of the heat exchanger; a gas-liquid separator(4) connected to one side of the heat exchange recovery part; a vacuum pump(30) installed at one side of the condenser; a recovery pipe(40) for recovering condensed methanol from the condenser to the methanol storage tank; a three-phase centrifugal separator(8) installed under the heat exchange recovery part; a glycerine storage tank(9) connected to the three-phase centrifugal separator; an ultra-high speed centrifugal separator(10) connected to the three-phase centrifugal separator; a water tank(12) installed in the ultra-high speed centrifugal separator; a biodiesel storage tank(11) for storing methyl ester(biodiesel); and a recovery pipe(40-1) for recovering water from the ultra-high speed centrifugal separator to the water tank.Image 1/1