Elementary Principles 179 - 6.23 (cont'd) b. Assume no...

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6- 13 6.23 (cont’d) b. Assume no condensation occurs during the compression 50% relative saturation at condenser inlet : 0500 0 703 7600 1068 10 00 4 .( ) . ( ( ) . ** pT HH =⇒ = × mmHg) T 0 187 = o C Saturation at outlet: 0050 7600 1 ( ) * mmHg) = 380 mmHg = H T 1 48 2 .C Volume ratio : 3 11 1 1 1 3 0 0 0 / ( 273.2) 0.682 kmol/min 321 K m out 0.22 / ( 273.2) 2.18 kmol/min 460 K m in Vn R T P n T R T P n T + == = × = + ± ± c. The cost of cooling to o 3.26 C (installed cost of condenser + utilities and other operating costs) vs. the cost of compressing to 10 atm and cooling at 10 atm. 6.24 a. Maximum mole fraction of nonane achieved if all the liquid evaporates and none escapes. ( SG ) nonane n l max 92 0 0 0 L C H 0.718 1.00 kg kmol L C H 128.25 kg 0 k m o l C H = × = 15 084 () . Assume T = 25 o C, P =1 atm n gas = × × = 21 0 818 4 L 273 K 1 kmol 298 K 22.4 10 L(STP) k m o l 3 . y n n gas max max . ./ = 0084 010 kmol C H 0.818 kmol kmol C H kmol (10 mole%) 0 0 As the nonane evaporates, the mole fraction will pass through the explosive range (0.8% to
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This note was uploaded on 02/27/2012 for the course CHEMICAL E 312 taught by Professor Cheung during the Fall '11 term at The University of Akron.

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