However, to validate the results, ChemCAD, the dynamical simulator is employed, whereas the same applied thermodynamic model. Hereby, without any further optimization, the interesting facts were retrieved for the change of heating energy during the respective process.In Figure , the optimal reboiler duty vs time function for all stages was presented for the LP step, however, also depicts the HP step: the extracted values for optimal reboiler duty vs time corresponding to the previously examined cases of boil-up set at 11 [mol/h]. Compared to the energy required to heat up the reboiler of the batch rectifier, it takes at least 14.88 times more to start up the batch stripper, from here the minimum total energy requirement is to be calculated for the start-up of the proposed dual process: 60400 kJ/h.