Discussion
Raising the pressure of a distillation generally
Answer: D
Correct answer: reduces the relative volatility and makes separation harder
Relative volatility falls as the pressure rises, because the components’ vapour pressures converge as the critical region is approached, so more stages or more reflux are needed for the same separation. Pressure is raised nonetheless where the condenser needs it - to allow cooling water rather than refrigeration - so the choice is a trade between separation cost and utility cost.
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