ch14 - CHAPTER 14 SOLUTIONS 14.1 Effect of absorbent rate...

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14-1 CHAPTER 14 SOLUTIONS 14.1 Effect of absorbent rate and number of stages on absorption (a) Double L to 474 kmol/hr. Then, the absorption factor for n-butane is doubled to 2.70. The number of stages remains at 4. From the Kremser equation, Eq. (14.5), 41 2.70 1 0.01193 2.70 1 1 1 0.01193 0.9881 K K A A + φ= = −φ = − = Or, 98.81% absorption of n-butane (b) Double number of stages to 8. The absorbent rate remains at 237 kmol/hr Then the absorption factor for n-butane remains at 1.35. From the Kremser equation, Eq. (14.5), 81 1.35 1 0.02519 1.35 1 1 1 0.02519 0.9748 K K A A + = = Or, 97.48% absorption of n-butane Doubling the absorbent rate is more effective than doubling the number of stages. This effect is confirmed by the Kremser plot. The result is more dramatic at larger number of stages.
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14-2 14.2 Determining a feasible operating pressure for distillation Follow the procedure of Figure 7.9. First find a suitable pressure at the top. Using a simulation program with the UNIFAC equation for estimating K -values
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ch14 - CHAPTER 14 SOLUTIONS 14.1 Effect of absorbent rate...

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