Homework+7 - Chemical Engineering 142 Homework Set#7 100...

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Chemical Engineering 142 Homework Set #7 100 points total Due Wednesday, March 10, 2010 Problem 1 (25 points) The dehydrogenation of ethanol (A) to acetaldehyde (B) and dihydrogen (C) is carried out in an adiabatic reactor. A B +C Pure ethanol at 400 °C is fed to the reactor, and a conversion of 30% is obtained. Determine the adiabatic reactor temperature (the reactor temperature at a 30% conversion), T ad . Assume the heat capacities for all species are functions of temperature. The following data may be useful. All C P values are given in units of kJ/mol-C C p,EtOH = 6.134 x 10 -2 + (1.572 x 10 -4 )T – (8.749 x 10 -8 )T 2 + (1.983 x 10 -11 )T 3 C p,acetaldehyde = 5.048 x 10 -2 + (1.326 x 10 -4 )T – (8.050 x 10 -8 )T 2 + (2.380 x 10 -11 )T 3 C p,H2 = 2.884 x 10 -2 + (7.65 x 10 -3 )T + (3.288 x10 -7 )T 2 – (8.698 x 10 -13 )T 3 Problem 2 (25 points) Nitrous oxide is produced from decomposition of molten ammonium nitrate NH 4 NO 3 (l) 2 H 2 O(g) + N 2 O(g) 500 lbmol/h of molten ammonium nitrate preheated to 250oF is fed into a reactor that operates adiabatically and isobarically (P=1atm). 75 lbmol/h of liquid water at 70 oF is fed separately into the reactor to dilute the ammonium nitrate concentration inside the reactor and to cool down the reactor. The exit stream contains H
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