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Split_00007 - 8.22(cont'd c From part(b 8.07 kg steam is...

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8- 7 8.22 (cont’d) c. From part (b), 8.07 kg steam is produced per 100 mol feed ± . . n feed = = × 1250 01 1 4 30 10 3 kg steam h kmol feed 8.07 kg steam h 3600 s kmol / s ± . . . V product gas 3 5 3 mol feed s mol product gas 100 mol feed 8.314 Pa m mol K 723 K 1.01325 10 Pa m / s = × = 4 30 1336 9 341 d. Steam produced from the waste heat boiler is used for heating, power generation, or process application. Without the waste heat boiler, the steam required will have to be produced with additional cost to the plant. 8.23 Assume Δ Δ Δ Δ H H H H mix C H O C H = + 0 10 12 2 6 6 Kopp’s rule : C p C H O d i e j e j 10 12 2 10 12 12 18 2 25 386 2 35 = + + = = ( ) ( ) ( ) . J mol C J g C o o Δ Δ Δ H H H C H O C H 10 12 2 6 6 20 0 1021 1 2 35 71 25 2207 150 879 1 0 06255 234 10 1166 2207 1166 3373 5 298 348 = = = + × L N M O Q P = = + = z . . ( ) . [ . . L g L kJ 10 J J g C C kJ L g L mol 78.11 g T] dT kJ kJ 3 o o b. References : H 2 O (l, 0.01 o C), C 3 H 8 (gas, 40 o C) C H kJ / mol kJ mol ( from Table B.2) 3 8 in ou p C 3 H 8 : ² ; ² . H H C dT C t p = = = z 0 1936 40 240 2 in out ˆ ˆ H O: 3065 kJ/kg (Table B.7); 640.1 kJ/kg (Table B.6) H H = = c. 3 8 C ˆ ˆ 19.36 kJ/mol, (640.1 3065) kJ/kg 2425 kJ/kg H w H H Δ = Δ = = − Q H H m H = = +
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