Test3Spring08 - 1 PGE 312 SPRING 2008 Physical and Chemical...

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PGE 312 – SPRING 2008 Physical and Chemical Behavior of Petroleum Fluids I Test #3, 50 Minutes Closed Book Note: It will be in your best interest to attempt all the questions. Please budget your time accordingly. Problem 1 (25 points) Figure 1 shows the results of a flash calculation for a ternary system at P = 1000 psia and T = 160 F. There are 80 lb moles of total mixture. The volume of the liquid is 50.46 cu ˚ ft. 1 2 3 Gas composition in mole fractions 0.7898 0.1208 0.0894 m p np y y y y y y y = = = Amount of gas 0.629 ? g g g n n n V = = = Amount of liquid ? 50.46 cu ft L L L n n n V = = = 1 2 3 Total composition in mole fractions ? ? ? m p np z z z z z z z     = = =       Amount of total mixture 80 lb moles V=? n = 1 2 3 P = 1000 psia, T = 160 F Methane: ? lb moles Propane: ? lb moles n-Pentane: ? lb moles m p np n n n n n n = = = = = = o 1 2 3 Liquid composition in mole fractions 0.2783 0.1994 0.5223 m p np x x x x x x x = = = Figure 1. Results of flash calculation.
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Test3Spring08 - 1 PGE 312 SPRING 2008 Physical and Chemical...

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