For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause ____________________ plate requirement?
Correct answer: D. Marginal decrease in the number of
- A. No change in theoretical
- B. None of these
- C. Major decrease in the number of
- D. Marginal decrease in the number of
Explanation
Ethanol-water separation becomes increasingly difficult near the azeotropic composition, so reducing the distillate specification from 95% to 92% gives only a marginal reduction in theoretical plates. A large reduction would be more likely when moving well away from the azeotrope.
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