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Extractive distillation and azeotropic distillation are used instead of conventional distillation for mixtures that are difficult...

Extractive distillation and azeotropic distillation are used instead of conventional distillation for mixtures that are difficult to separate. Give a brief description of each process and explain the function of the solvent in each case. Discuss an example of each, sketching out a flowsheet, and thus explain why the capital expense of plant in each case is greater than for conventional distillation.

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