Rectified spirit obtained by fermentation con | vedclass

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(D) Rectified spirit is an azeotropic mixture of $95.5 \%$ ethanol and $4.5 \%$ water. Since this mixture boils at a constant temperature,it cannot be

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It forms low-boiling azeotropic mixtures which distill over,leaving behind pure alcohol which can then be distilled.

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(D) Rectified spirit is an azeotropic mixture of $95.5 \%$ ethanol and $4.5 \%$ water. Since this mixture boils at a constant temperature,it cannot be separated by simple fractional distillation. Benzene is added to form a ternary azeotrope with water and ethanol,which has a lower boiling point $(64.9 \ ^{\circ}C)$ than the binary azeotrope of ethanol-water $(78.1 \ ^{\circ}C)$. This ternary azeotrope distills off first,leaving behind pure (absolute) alcohol.

Rectified spirit obtained by fermentation contains $4.5 \%$ of water. To remove this water,rectified spirit is mixed with a suitable quantity of benzene and heated. Benzene helps because:

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