Observation shows that the time has been increased significantly at the purity of product 0.95 compared with that for product
purity 0.85 mole fraction to meet the product specifications, which will affect the operating cost of the process. In such circumstance single reboil inverted batch distillation will not be suitable and
multi-reboil of short duration operation might have to be sought
(detailed investigation has not been presented here) to satisfy high
product purity (more than 0.95 mole fraction of lactic acid).