HW5 - University of California Santa Barbara Department of...

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University of California – Santa Barbara Department of Chemical Engineering ChE10: Introduction to Chemical Engineering Professor Mike Gordon, Fall 2009 Homework #5 : due Wednesday 25 Nov. 09 (1) The natural gas going to your stove has the following molar composition: 88% methane, 4% ethane, 2% propane, 2% iso-butane (C 4 H 10 ), 3% nitrogen, 1% CO 2 Assume that the gas is burned with 10% excess air under the following conditions: (a) 95% methane conversion, 90% ethane conversion (b) the propane mole fraction in the outlet is 0.001 (c) the CO 2 to CO selectivity is 4 (d) all the iso-butane is totally burned Answer the following questions: (i) Draw a flow-sheet (ii) What reactions should be considered? (iii) Find the inlet air flowrate if 100 mol/min of gas enters the stove (iv) Find the outlet gas composition by setting up a matrix equation and solve it with MatLab or Mathematica. (2) Dry nitrogen is pumped into a glovebox to protect an experiment that is hyper-sensitive to oxygen. The box is maintained at a slight positive pressure (3 in-H 2 O) above atmospheric to prevent oxygen from back-diffusing into the box via the vent line. The gas contents of the box must be fully replaced
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This note was uploaded on 01/05/2010 for the course CHE CH E 10 taught by Professor Gordon during the Fall '09 term at UCSB.

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HW5 - University of California Santa Barbara Department of...

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