[mol/h], the disappearance of even three cycles occurred, and up to 8 [mol/h], four cycles are disappeared. The observations made via the influence of the vapor boil-up on the optimal control pattern, enable us to extend the conclusions toward the prediction of the optimal heating strategy, for each particular case. Finally to make the final conclusions about the total energy expenditure (overall the process), moreover to examine thoroughly the possibility of internal heat integration (Li et al., [6]). Compared to the previous cases, the operation should be initialized at higher values, however, the subsequent almost instantaneous decreasing pique appeared again (Figure ). It is perceived, that both consecutive "energy gaps" are broadened", this is followed by a very flattened decrease till the end of the first half of the total time. For the first operational strategy proposed, the flattened area keeps its average value, but, almost double, compared to the second one. This is followed by a more steep, since greater step, stepwise increase reaching the very last pique before switching to the minimum of energy, followed by the final instantaneous increase of more than 3 times. On the other side, the second proposed strategy, the "last" stepwise increase is instantaneously switched to the even greater pique, even on average three times more compared to the first one. It is also important to mention that, the last pique of the increase reaches more than 30% of the final estimated maximum, reboiler duty.