Elementary Principles 310 - 8.56 (cont'd) References:...

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8- 31 8.56 (cont’d) References : Solids (0.01 ° C), HO 2 ( l , 0.01 o C) Substance in m ± ² H in out m ± ² H out Solids HO 2 l bg 2 v 200 800 62.85 125.7 200 571.4 428.6 209.6 419.1 2676 ( ) kg h m ± ² H kJ kg ² H 2 from steam tables 2 , 1.6 bar 1 m ± 2696.2 1 m ± 475.4 E.B. 6 11 out in ˆˆ 0 1.315 10 2221 0 592 kg steam h ii Q H mH m m = Δ =−= × = = ∑∑ ±± ± ± b. () 592.0 428.6 163 kg h additional steam −= c. The cost of compressing and reheating the steam vs. the cost of obtaining it externally. 8.57 Basis: 15,000 kg feed/h . A = acetone, B = acetic acid, C = acetic anhydride (kg A( )/h) 15000 kg/h l 0.46 A 0.27 B 0.27 C 348 K, 1 atm still n 1 303 K (kg A( )/h) v n 1 329 K 2 condenser (kg A( )/h) l n 1 303 K Q (kJ/h) c reboiler
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