Firstly, the operation is managed under standard atmospheric pressure, with the aim to distill acetone ie. 75% of left in the accumulator. Consequently, the purified methanol (96.59%) is obtained in the reboiler and withdrawn. Furthermore, the reboiler is heated by an additional auxiliary exchanger ), prior to being pumped to the higher pressure and introduced to the second column, this is necessary to increase boil-up. In the stripping step, the mixture near the azeotropic mixture is collected in the condenser, so as to obtain purified methanol in the second tank. Moreover, the interesting fact is that both, the purity and the recovery rate, tend to improve but at the cost of the total batch time. As a consequence, it is a must to "repeat" a step to purify the next batch up to 95.50% and increase the recovery rate by an additional 3% (Table ). The total duration proposed for the best performance of the dual process is t t =2.4 [h].