adsorption, depressurization, purge, and pressurization. Anhydrous ethanol was produced by repeatedly applying these four steps using the HMI program [15]. Firstly, steam was supplied to the vaporizer and super heater, and cooling water was supplied to the product condenser and purge condenser. Subsequently, a vacuum circulation pump and vacuum pump were operated, and anhydrous ethanol was finally produced using an adsorption bed.