Elementary Principles 174

Elementary Principles 174 - 6.16 T = 90 F = 32.2 C , p =...

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6- 8 6.16 T ° 90 F = 32.2 C, p = 29 7 . in Hg = 754.4 mm Hg , h r = 95% Basis : 10 gal water condensed/min 3 2m 3 m 10 gal H O 1 ft 62.43 lb 1 lb-mol 4.631 lb-mole/min min 7.4805 gal ft 18.02 lb condensed n == ± at inlet: 0.95 32.2 C HO 2 hy P p r =∗ ° bg y 2 2 mm Hg 754.4 mm Hg lb - mol H O lb - mol 0 95 36068 0045 .. . () * 222 6.274 Raoult's law: 4.4 C 0.00817 lb-mol H O lb-mol 754.4 yP p y 12 1 2 Mole balance: 4.631 124.7 lb-moles/min Water balance: 0.045 0.00817 4.631 120.1 lb-moles/min nn n n =+ = ⎫⎧ ⎬⎨ = ⎭⎩ ±± ± ± 3o o 43 124.7 lb-moles 359 ft (STP) (460+90) R 760 mm Hg Volume in: = min lb-moles 492 R 754 mm Hg 5.04 10 ft / min V ± 6.17 a. Assume no water condenses and that the vapor at 15 ° C can be treated as an ideal gas. pp final 2 2 760 mm Hg K (200 + 273) K mm Hg ( mm Hg C) =12.79 mm Hg < Impossible condensation occurs. HO f
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