Fall05_Test2_Key

# Fall05_Test2_Key - 1 PGE 312 - FALL 2005 Physical and...

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1 PGE 312 - FALL 2005 Physical and Chemical Behavior of Petroleum Fluids I Test #2, 50 Minutes Solution Key Problem 1 (20 points) Ninety one (91) milli moles of ethane and thirty nine (39) milli moles of normal heptane are charged into a PVT cell at T = 100 ° F and P = 500 psia. The equilibrium ratios (k- values) for the ethane and normal heptane at the given conditions are as follows: k 2 = 1.3388 k 7 = 0.0232 Determine the state of the system. The total system composition is given by 2 7 91/130 0.70 39/130 0.30 z z  ==   0.944 1.0 ii zk =< 13.454 1.0 i i z k => Therefore, the system is all liquid. a. Calculate the milli moles of liquid in the cell. n = n 2 + n 7 = 91 + 39 = 130 milli moles of mixture. Since the system is all liquid, n L = n = 130 milli moles of liquid. b. Calculate the composition of the liquid in the vessel in mole fractions. The liquid composition is equal to the total system composition and is given by 22 77 0.70 0.30 xz   

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2 Problem 2 (40 points) Figure 1 shows the results of a flash calculation. Figure 1. Results of a flash calculation. 1 2 3 Gas composition(mole frac) 0.7768 0.1174 0.1058 m p np yy y   == =  Amount of gas 43.4560 lb moles 0.5432 ? g g g g n n n n V = = Amount of liquid 36.5440 lb moles 0.4568 ?
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## This note was uploaded on 04/21/2010 for the course PGE 312 taught by Professor Peters during the Fall '08 term at University of Texas.

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Fall05_Test2_Key - 1 PGE 312 - FALL 2005 Physical and...

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