If a1 and a2 are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement ?
Correct answer: B. None of these
- A. a1 = a2
- B. None of these
- C. a1 = 0.5 a2
- D. a1 = 2a2
Explanation
Relative volatility depends on the vapour-liquid equilibrium and generally changes with pressure and temperature, but its change between 1 and 2 atm is not fixed by a simple ratio. Therefore, none of the stated equalities can be guaranteed.
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