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Unformatted text preview: DEPARTMENT OF CHEMICAL ENGINEERING UNIVERSITY OF CALIFORNIA, SANTA BARBARA PRACTICE MIDTERM One hour, open books and notes, no collaborations, questions, etc. after the test is begun. Directions 1. This is a multiple choice section. There are four answers possible - A, B, C, D. If If If If mark D A > B - mark A B > A - mark B A = B - mark C the two things cannot be compared or if insufficient information Remember units must be homogeneous and significant figures are important. A a. 2.498 N- 1.49 N B kg-m 1010 sec2 b. Pressure PA c. tan (100.0 lbf) Pressure PB tan (444.8 N) For parts d-g consider the reaction 3 H 2 + N 2 −> 2 N H 3 Input 240.0 kmole/hr H2, 85.0 kmole/hr N2 , 50% conversion of limiting reactant A Answer B d. % excess H2 6.25% e. % excess N2 6.25% f. moles/hr H2 unreacted moles/hr NH3 produced g. moles/hr N2 unreacted moles/hr NH3 produced h. A. # of independent equations B. # of unknowns i. A. Q1 B. 400 kg/hr j. A. x2 B. y2 ______ 3. Propane (C3H8) reacts to form propylene (C3H6) and hydrogen (H2) according to the reaction: C3H8 -> C3H6 + H2 The single-pass conversion of propane to propylene based on the total propane feed to the reactor is 40%. The feed is pure propane gas and the propylene product flow rate FC3H6 is 50 kmol/hr. The separator divides the effluent into three pure streams, the product, which is pure propylene, a recycle stream of pure propane, RC3H8, and a waste stream of pure hydrogen FH2. a) b) c) d) Do a degree of freedom analysis and determine if this problem can be solved Balance a flow chart for this process if your answer to part a is yes If the answer to part a is no, let FH2 = 50 kmol/hr. Can the problem be solved now? What is the overall conversion of propane in the reactor based on the fresh feed to the process given either scenario? FH 2 FC 3 H 6 Separator Reactor RC3H8 ...
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