Spring08_Test3_Key - 1 PGE 312 SPRING 2008 Physical and...

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1 PGE 312 – SPRING 2008 Physical and Chemical Behavior of Petroleum Fluids I Test #3, 50 Minutes Solution Key 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. The physical properties of the components are as follows:
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2 Component Critical Pressure (psia) Critical Temperature ( ° F) Molecular Weight (lbm/lb mole) Methane 666.40 -116.67 16 Propane 616.00 206.06 44 n-Pentane 488.60 385.60 72 Calculate or otherwise determine the following items for this system.
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