Because the research work has indicated that R should be recovered at an absolute pressure of 10 mmHg, the relative volatility of P to R should be evaluated at this pressure.
Vapor pressure, mmHg
(As will be discussed later; it is not essential that the separation system be operated at the design pressure throughout the distillation. Therefore, the relative volatility was averaged over three pressures in the vicinity of the design point.) The equilibrium vapor-liquid compositions were calculated using this value for relative volatility:
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