For a batch binary stripping distillation under ideal operating condition

with constant reboil ratio and infinite number of theoretical plates

a function was derived in this study

and the variation of instantaneous constant composition region may be evaluated by the value of this function.Thus the calculation method for the minimum reboil ratio of the batch binary stripping distillation was improved.A formula was deduced for computing the minimum total vapor capacity of the distillation under constant residual fraction composition and ideal operating condition.The results show that to achieve high yield and high average concentration of heavy component in the residual fraction

the energy consumption of the batch stripping distillation at constant reboil ratio is higher than that at constant residual fraction composition because the low efficient consumption of total energy (which is the inefficient total energy consumption with infinite number of theoretical plates)accounts for a large portion of the total energy consumption.