Discussion
Ethanol is recovered from the fermented broth by
Answer: B
Correct answer: distillation, then dehydration
Fermentation gives a broth of perhaps 10 to 15 per cent ethanol, which distillation concentrates to about 95 per cent by volume. Getting beyond that requires a further step - azeotropic or extractive distillation, or more usually molecular sieve adsorption - for the reason the next item gives.
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