Elementary Principles 62 - 4.31 (cont'd) c. B fraction in...

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4- 21 4.31 (cont’d) c. B fraction in bottoms : x B = 0100 .m o l B / m o l Moles of overhead : ± . n 1 460 = mol Moles of bottoms : ± . n 3 540 = Recovery of toluene : 1 050100 100% 1 010 5402 050 100 100% 97% 3 ×= xn B bg b g ± . .. . 4.32 a. 0 12 0 88 kg S / kg kg H O / kg 2 . . m 1 012 088 kg kg S/ kg kg H O / kg 2 b g . . m 4 058 042 kg kg S/ kg kg H O / kg 2 b g . . m 2 012 kg kg S/ kg kg H O / kg 2 b g . . m 5 0 42 0 58 kg kg S/ kg kg H O / kg 2 b g . . m 3 kg H O 2 b g Mixing point Bypass Evaporator Overall process : 2 unknowns ( mm 35 , ) Bypass : 2 unknowns ( 12 , ) – 2 balances – 1 independent balance 0 DF 1 DF Evaporator : 3 unknowns ( mmm 134 ,, ) Mixing point : 3 unknowns ( 245 ) – 2 balances – 2 balances 1 DF 1 DF Overall S balance : 012 100 5 = m Overall mass balance : 100
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