ECH51FinalPracticeExam_2017.pdf

# Part ii the fraction of excess copper in the feed

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Part II. The fraction of excess copper in the feed (stream #1) is defined by ϕ = fraction of excess copper = molar flow rate of copper entering in feed stream - molar rate of consumption of copper in the reactor molar rate of consumption of copper in the reactor If the fraction of excess copper ϕ = 0.35 , what is the ratio m 1 / m 5 The following data is given Species Molecular Weight lb m lb - mole Ag 2 SO 4 312 Cu 63.5 Ag 107.9 CuSO 4 159.6 ECH51FinalPracticeExam_2017.nb 9

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������� �� ��� ������� A fuel (Stream #1) of unknown composition is burned with 20% excess air (Stream #2). The flue gas (Stream #3 ) is analyzed ( on a dry basis ) and found to contain 8.4% CO 2 , 1.2% CO, 4.2% O 2 and the rest N 2 . The fuel is known to contain methane ( CH 4 ) , ethane ( C 2 H 6 ) , and N 2 . You may assume that the molar flow rate of dry flue gas is 100 mol/hr. (i) Determine the molar flow rate of air entering the combustor in terms ( M CH 4 ) 1 and ( M C 2 H 6 ) 1 (ii) Determine the rates of production of R CH 4 , R C 2 H 6 and R O 2 in terms of the other rates of production (iii) Write down the species balances for a control volume that cuts streams #1,. #2 and #3 (iv) Determine the molar flow rates of all species in stream #1 and the molar flow rate of H 2 O in stream #3. ������� �� ��� ������� Ethylene oxide (EO= C 2 H 4 O ) is produced by the catalytic oxidation of ethylene (E= C 2 H 4 ) An undesired competing reaction is the combustion of ethylene to produce CO 2 and 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 which are then recycled back to the reactor in Stream # 4. The reactor products (EO, H 2 O and CO 2 ) 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 in terms of the molar flow rate of ethylene in stream #2 (iii) Determine the overall conversion of ethylene for the process. The composition matrix N JA for this system is N JA = 2 0 1 0 2 0 2 2 1 1 4 0 0 2 4 where the rows represent the atomic species C, O and H. The row echelon form is N JA * = 1 0 0 1 2 1 0 1 0 3 2 1 2 0 0 1 - 1 0 ������� �� ��� ������� (i) Suppose you have a stream with two species A and B. The mole fraction of species A in the stream is x A , Derive a formula for the mass fraction ω A of species A in terms of the mole fractions x A and x B and the molecular weights of species A and B.
• Fall '13
• Brian

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