Extractive distillation is an effective separation technique used to separate two substances with similar boiling points by adding a third substance in the presence of miscible, high boiling, the relative nonvolatile component that forms no azeotrope with the other components in a mixture. extractive distillation uses a separation solvent which is usually nonvolatile has a high boiling point and is miscible with the mixture, but does not form an azeotropic mixture. the given solvents interact differently with the components of the mixtures. Extractive distillation is used for mixtures having a low value of relative volatility, nearing unity.
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