A batch distillation column with three theoretical stages (first stage is the still pot) is charged with \(100 \mathrm{kmol}\) of a \(50.0 \mathrm{~mol} \%\) n-hexane in \(n\)-octane liquid mixture at atmospheric pressure (the phase-equilibrium curve is given in Figure 6.25). A liquid distillate containing \(90 \mathrm{~mol} \%\) hexane is to be maintained by continuously adjusting the reflux ratio while maintaining a distillate rate of \(20.0 \mathrm{kmol} / \mathrm{h}\). What should the reflux ratio be after \(1.0 \mathrm{~h}\) when the accumulated distillate is \(20.0 \mathrm{kmol}\) ?

Theoretically, when must distillate accumulation be stopped?

Data From Figure 6.25:-

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0.8 0.6 0.4 70 0.2 0 =0.09 0 = 0.2 0.2 0.4 Initial operating line x=0.6 x -0.85 0.6 0.8 Figure 6.25 McCabe-Thiele diagram for Example 6.14. 1