Solvent Swap Distillation

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Consider a binary mixture containing a solvent (60 mole% methanol) and a solute (40 mole% 1-hexanol). We carry out a solvent swap using batch rectification. A second solvent (1-propanol) is fed into the still to replace the methanol. This is possible since 1-propanol has a higher boiling point than the original solvent. The flow rate of the fresh 1-propanol stream is such that the volume of the still is kept constant during the entire duration of the solvent swap. For simplicity, assume that the mixture obeys Raoult's law (all three species are aliphatic alcohols). You can set the reflux ratio, the number of stages of the column, and the holdup of the trays and condenser.
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Contributed by: Housam Binous, Mamdouh Al-Harthi, and Ahmed Bellagi (October 2015)
Open content licensed under CC BY-NC-SA
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"Solvent Swap Distillation"
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Published: October 6 2015