Design a process for the separation of \(1,000 \mathrm{kgmol} / \mathrm{hr}\) of a mixture composed of \(50 \mathrm{~mol} \% \mathrm{~A}\) and \(50 \mathrm{~mol} \% \mathrm{~B}\) (water) to product streams: a highly pure stream of A (at least \(99 \mathrm{~mol} \%\) ) and a purified water stream (at least \(90 \mathrm{~mol} \%\) ). Your design should consist of as few distillation columns as possible, with each column having only two product streams (distillate and bottoms), with each column operating either at 2 or 10 bar. You may consider the usage of entrainer \(C\). Boiling temperature data for the system A-B-C are provided in Table 9.9 for the two possible operating pressures. Ternary diagrams at the two pressures are provided in Figure 9.54 noting that the system exhibits regions of liquid-liquid equilibrium at both of the operating pressures.

(a) Design a separation process for the production of \(\mathrm{A}\) and \(\mathrm{B}\) as specified above. Draw the operating lines for your process on the ternary phase

diagram(s) provided in Figure 9.54, and provide a PFD indicating key compositions and temperatures.

(b) If your solution includes the usage of entrainer \(\mathrm{C}\) estimate the required feed rate of \(\mathrm{C}\) at steady state in \(\mathrm{kgmol} / \mathrm{hr}\).

Figure 9.54:-

Transcribed Image Text:

Table 9.9 Boiling Temperature Data for the System A-B-C in Exercise 9.19 (a) P = 2 bar Pure Pure Pure A B C Azeo-I Azeo-II Azeo-III Azeo-IV A 1.00 0.00 0.00 0.70 0.40 0.00 0.15 B 0.00 1.00 0.00 0.30 0.00 0.30 0.30 C 0.00 0.00 1.00 0.00 0.60 0.70 0.55 Temperature (C) 100 120 130 95 90 110 85 (b) P=10 bar Pure Pure Pure A B C Azeo-I Azeo-II Azeo-III Azeo-IV A 1.00 0.00 0.00 0.70 0.25 0.00 0.10 B 0.00 1.00 0.00 0.30 0.00 0.20 0.15 C 0.00 0.00 1.00 0.00 0.75 0.80 0.75 Temperature (C) 150 170 180 135 145 160 130