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A mixture of 80 mole% ethane (C2H6) and 20 mole% hydrogen (H2) flowing at rate of 200 mol/h is burned with 30% excess air. 92%
A mixture of 80 mole% ethane (C2H6) and 20 mole% hydrogen (H2) flowing at rate of 200 mol/h is burned with 30% excess air. 92% fractional conversions of C2H6 and 85% of H2 are achieved with below reactions. 7 (reaction 1) C2H6 + z 2 + 2 CO2 + 3 H20 2 H2 + O2 2 H20 (reaction 2) Beside, the below undesired reaction also got carried out in the same reactor resulting to produce Co. Of the C2H6 that reacts, 85% formed CO2 and the balance reacted to form CO. Process flowchart is given. Solve for the following: 5 (undesired reaction) C2H + 2 CO + 3H20 za ne=200 (mol/h) =0.8 YHz=0.2 nair Yoz=0.21 Yn2=0.79 ng (mol/h) ni (mol-C2H/h) n2 (mol-H/h) n3 (mol-Co/h) n4 (mol-CO/h) ng (mol-H2O/h) no (mol-0/h) n7 (mol-Ny/h) (1 pt) (1 pt) (1 pt) (2 pt) a) Stoichiometric moles of O2 required b) Determine amount of air fed to the process (nair) c) Prove that CzHg is the limiting reactant d) Perform the degree-of-freedom analysis, based on molecular balance method, and comment of your results e) Calculate molar flowrates of C3H8 (n), H2 (n2), CO2 (n3) and CO (na) leaving the reactor. (Hint: use given process information) f) Calculate molar flowrates of effluent stream (ns) from the reactor using atomic balance method (Hint: input-output) g) Calculate the selectivity and yield of CO2 production (2 pt) (2 pt) (1 pt)
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