Elementary Principles 386

# Elementary Principles 386 - 9.28 (cont'd) QF = H = 19400...

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9- 34 c. ± ± . . QH F == Δ 19400 mol H O 18.0 g 1 kg kJ h1 m o l 1 0 gk g kJ h steam generator 2 3 3928 104 8 134 10 6 af bg Reactor C : References : CH v, H g, HOv a t 600C 88 81 0 2 2 ° ² HC d T ip v i 560 600 560 D C ej di = z for CH , CH 0 88 ² (, H T) for H H O (interpolating from Table B.8) 22 Substance (mol h (kJ mol (mol h (kJ mol C H 2740 HO H in in out out 0 2 2 ± ) ² ) ± ) ² ) . . . . n H n H 0 1780 1168 19900 0 19900 156 960 10 86 960 119 −− Energy balance : ± ± ± ² ± ² . Q H nH ci i i i + ∑∑ Δ 960 mol C H produced 124.5 kJ m o l C H kJ h reactor out in 561 10 4 This is a poorly designed process as shown. The reactor effluents are cooled to 25 D C , and then all but the hydrogen are reheated after separation. Probably less cooling is needed, and in any case provisions for heat exchange should be included in the design. 9.29 a. b. CH OH HCHO H , H 1 2 OH O 32 2 2 2 →+ + (mol CH OH/h) 0.42 mol CH OH/mol n f (mol/h) at 145°C, 1 atm 3 reactor n s mol H O( )/h 2 0.58 mol air/mol
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