n-butane is added to gasoline to help control its vapor pressure so that the gasoline performs...
n-butane is added to gasoline to help control its vapor pressure so that the gasoline performs optimally at both hot and cold ambient temperatures. A vapor mixture of 50 mol% n-butane (p* = 5 bar) and 50 mol% n-heptane (p* = 2 bar) is at low pressure. The mixture is partially condensed by isothermally raising the pressure to 4 bar.
Which statement is correct?
Why?
A. n-butane is enriched in the liquid phase
B. n-heptane is enriched in the liquid phase
C. The liquid phase has a 50/50 composition
D. No liquid forms
Homework Answers
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n-butane is added to gasoline to help control its vapor pressure
so that the gasoline performs...
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CONFIDENTIAL BKC/1617/BKF2343 QUESTION 1 An equimolar vapor mixture of n-pentane and n-hexane at 110°C and 1 atm is fed into a condenser at a rate of 200 L min When the feed is cooled and compress...
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c. What is the mixture of compounds shown as compound C?
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Flashing a hydrocarbon mixture An equimolar mixture of propane, n-butane, i-butene and pentane is flashed at a total pressure of 4 bar so that the ratio of the molar vapor phase flow rate and molar liquid phase flow rate is 1: nv RL Retrieve the physical properties needed from reliable sources and write a Mat- lab or Mathematica or Excel script that calculates the temperature at which the mixture has to be flashed.
At 1,013 bar total pressure propane boils at -42.1°C and n-butane boils at -0.5°C; the following vapor pressure data are available. T("C) Pp partial pressure of Propane (in kPa) Ph partial pressure of n-butane (in kPa) -31.2°C 160.0 26.7 -16.3°C 298.6 53.3 Assuming that these substances form ideal binary solutions with each other. (a) calculate the mole fractions of propane at which the solution will boil at 1.013 bar total pressure at -31.2 and -16.3°C. (b) Calculate the mole fractions...
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6. At 25°C, the vapor pressure of pure pentane, n-CsH12 is 0.674 bar and that of pure hexane, n- C6H14 is 0.198 bar. Assuming these two compounds form an ideal solution: (a) Prepare a pressure-composition (p vs mole fraction) diagram for this binary system. (b) Calculate the partial pressure of each substance and the total pressure over the solution that has a mole fraction of pentane, Xcm.=0.35 (c) What is the composition of the vapor phase in equilibrium with the...
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c. What is the mixture of compounds shown as compound C?
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