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Separation Process Principles- 2n - Seader & Henley - Solutions Manual

969 for w and 0031 for b the less w rich phase

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Unformatted text preview: r with API-SRK for K-values, with the immiscible option and the three-phase flash model. The following results are obtained: T = 70.8oC Vapor mole fractions are toluene 0.23, ethyl benzene 0.13, water 0.64 Exercise 4.74 Subject: Bubble, dew, and 50 mol% flash conditions for water-n butanol mixture. Given: Mixture of 60 mol% water (W) and 40 mol% n-butanol (B) at 101 kPa Find: (a) Dew-point temperature and liquid composition. (b) Bubble-point temperature and vapor composition. (c) Temperature and phase compositions for 50 mol% vaporization. Analysis: Use the CHEMCAD simulator with UNIFAC LLE for K-values, with the three-phase flash model. The following results are obtained: (a) 100.1oC with liquid mole fractions of 0.242 for W and 0.758 for B. (b) 93.5oC with vapor mole fractions of 0.773 for W and 0.227 for B. Note that the liquid consists of two phases, with the water-rich phase containing mole fractions of 0.969 for W and 0.031 for B. The less W-rich phase contains mole fractions of 0.564 for W and 0.436 for B. (c) 94.5oC with vapor mole fractions of 0.742 for W and 0.258 for B and a single liquid-phase mole fractions of 0.458 for W and 0.542 for B. The results deviate somewhat from Fig. 4.8. Exercise 4.75 Subject: Isothermal three-phase flash of 6-component mixture. Given: Feed mixture with composition given below. Find: Flow rates and compositions for 25oC and 300 kPa. Analysis: Use the CHEMCAD simulator with UNIFAC LLE for K-values, with the three-phase flash model. The following results are obtained: kmol/h: Component: Feed Vapor Liquid I Liquid II Hydrogen 350 349.90 0.07 0.03 Methanol 107 4.87 14.31 87.82 Water 491 3.32 3.04 484.64 Toluene 107 0.75 106.16 0.09 Ethyl benzene 141 0.37 140.59 0.04 Styrene 350 0.57 349.19 0.24 Total: 1,546 359.78 613.36 572.86 Exercise 5.1 Subject: Three-column interlinked cascade for a four-component system. Given: Configuration for a two-column interlinked cascade for a three-component system Find: Devise the three-column cascade. Analysis: The system is shown in the sketch below. Assume that the feed is comprised of components A, B, C, and D in the order of decreasing volatility. Starting from the feed end at the left-hand side, Column 1 performs a sloppy split to separate the feed into an overhead of A, part of B, and part of C; and a bottoms of part of B, part of C, and D. In the second column, the overhead is A and part of B, the middle sidestream is part of B and part of C, while the bottoms is D and part of C. In the third column, the four products are removed in nearly pure states. Exercise 5.2 Subject: Given: Batch cascades for liquid-liquid extraction Batch process in Fig. 5.19 Find: (a) Cascade diagram for Fig. 5.19. (b) Type of cascade in Part (a). (c) Comparison of process in Fig. 5.19 to a single stage process. (d) Modification to achieve a countercurrent cascade. Analysis: (a) A cascade diagram representing Fig. 5.19 is the following: Exercise 5.2 (continued) (b) The above cascade is a two-dimensional triangular cascade of the crosscurrent type. (c) For a single batch extraction...
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