ECH51PracticeFinalExam_06_2 - UNIVERSITY OF CALIFORNIA...

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UNIVERSITY OF CALIFORNIA Department of Chemical Engineering and Materials Science ECH 51 Material Balances Practice Final Exam (Closed book and notes; no questions asked or answered) (Duration: 110 min ) Given for Exam: Total Mass Balance (1) ÅÅÅÅÅÅÅ t H t L r „ V + H t L r H v - w L ÿ n A = 0 Species Mass Balance (2) ÅÅÅÅÅÅÅ t H t L r A V + H t L r A H v A - w L ÿ n A = H t L r A V, A = 1, 2, …, N Problem 1 (10 points) Ethylene oxide (EO) is produced by the catalytic oxidation of ethylene (E) (3) 2 C 2 H 4 + O 2 ö 2 C 2 H 4 O An undersired competing reaction is the combustion of ethylene (4) C 2 H 4 + 30 2 ö 2 CO 2 + 2 H 2 O The feed to the reactor Stream #2 (not the fresh feed to the process) contains 3 mole of ethylene per mole of oxygen. The single pass conversion of ethylene is 20%, and for every 100 moles of ethylene consumed in the reactor 90 moles of ethylene oxide emerges in the reactor products (Stream # 3). The exit stream from the reactor Stream #3 is fed to a separation unit that separates ethylene and O 2 from the reactor products (EO, H 2 O and CO 2 ) which are then recycled back to the reactor in Stream # 4. The reactor products leave the separation unit in Stream #5. (i) Draw a flow chart for the process and label the streams. (ii) Determine the molar flow rates of ethylene(E) and O 2 in stream #1 (iii)Determine the overall conversion of ethylene.
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  • Summer '13
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