hw12 - CE 561 Homework 12 Assigned due(1 Consider the...

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CE 561 Homework 12: Assigned 11/30/09, due 12/07/09 (1) Consider the reactions (1) A + ½ B → C + 2 D, with r 1 = k 1 C A C B (2) A + 2 B → E + 2 F, with r 2 = k 2 C A C B (3) A + F → C + 3 D, with r 3 = k 3 C A C F Where specie s C and D are desired products, while species E and F are undesired byproducts. These reactions occur in an adiabatic CSTR at a constant density of 500 kg/m 3 . The feed stream contains species A and species B, in a 2 to 1 ratio (stoichiometric ratio for reaction 1) in an inert solvent. The specific heat of the mixture is 2.5 kJ/(kg K). Reaction (1) is slightly exothermic, with H r, 1 = - 36 kJ/mol. Reaction (2) is highly exothermic , with ∆ H r ,2 = - 890 kJ/mol. Reaction (3) is endothermic, with H r ,3 = 206 kJ/mol. The rate constants are given by: k 1 = 2×10 5 exp( - 80 kJ mol -1 /( RT )) L mol -1 s -1 k 2 = 1×10 11 exp(- 200 kJ mol -1 /( RT )) L mol -1 s -1 k 3 = 2×10 15 exp(- 220 kJ mol -1 /( RT )) L mol -1 s
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