The paper demonstrates use of two commonly used methods for fractional distillation column computations, namely Ponchon Savarit and McCabe Thiele. For multistage tray towers Ponchon Savarit method was first developed for the case of negligible heat losses. The use of the method is illustrated in the case studies. The method is rigorous and time consuming. The McCabe Thiele method is less rigorous as it doesn't enthalpy data. By McCabe Thiele method, Total 8 numbers of stages are required for desired separation. By Ponchon Savari Method, Reflux ratio R =1.4. Minimum numbers of were estimated to be 7.