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I read from a source that aniline and water can be separated by steam distillation. But isn't this senseless as steam distillation will simply add more water and make separation more difficult?

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Can't we just distill the aniline off?

The boiling point of aniline is around 180 °C. Remember that water boils at 100 °C.

Do water and aniline mix?

Yes, but the solubility of aniline in water is rather low (around $\pu{30 g/l}$).

What's the advantage of the steam distillation?

Aniline and water form an azeotrope with a boiling point around 98 °C.

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  • $\begingroup$ Can't we just distll the water off? $\endgroup$ – Aaron John Sabu Mar 28 '17 at 17:32
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    $\begingroup$ @AaronJohnSabu No, because the boiling point of the azeotrope is lower than that of water. $\endgroup$ – Klaus-Dieter Warzecha Mar 28 '17 at 18:13

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