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The extractive distillation of minimum and maximum boiling azeotropic mixtures A-B with a heavy or a light entrainer was introduced, intending to assess its feasibility based on thermodynamic insights. Differential equations are derived for each section composition, depending on operating parameters: distillate product purity and recovery, reflux ratio R and entrainer - feed flow rate ratio FE/F for the heavy case; bottom product purity and recovery, reboil ratio S and entrainer - feed flow rate ratio for the light entrainer case. This feasibility analysis methodology can be exploited to...