Batch distillation of azeotropic mixtures in a regular and inverted batch column

Batch distillation is an efficient unit operation which allows the separati on of a multicomponent mixture into its pure constituents in a single colum n. However, the separation of azeotropic mixtures by distillation is quite difficult because at the azeotrope the liquid and the gas have the same com position and, in turn, the driving force for distillation disappears. A sys tematic presentation of batch distillation processes for the separation of binary azeotropic mixtures using an entrainer is given.