# Figure Vapor-liquid equilibrium for a binary mixture. The dashed lines show the equilibrium compositions.

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1 Another way to view this problem is to say that the final volume contains V m 3 of alcohol at 5.93 kpa and 20 C V m 3 of air at kpa and 20 C V m 3 of air plus alcohol at 100 kpa and 20 C Thus, the volume could be calculated from the information about the alcohol Vapor-Liquid Equilibria for Multicomponent Systems In two-phase vapor-liquid mixture at equilibrium, a component in one phase is in equilibrium with the same component in the other phase. The equilibrium relationship depends on the temperature, pressure, and composition of the mixture. Figure 13.7 illustrates two cases, one at constant pressure and the other at constant temperature. Figure Vapor-liquid equilibrium for a binary mixture. The dashed lines show the equilibrium compositions. Henry's law. Used primarily for a component whose mole fraction approaches zero, such as a dilute gas dissolved in as liquid: p i = H i x i (12) Where p i is the pressure in the gas phase of the dilute component at equilibrium at some temperature, and H i is the Henry's law constant. Note that in the limit where x i 0, p i 0. Values of H can be found in several handbooks. Note that And since Hi, is roughly independent of p tot, the higher the total pressure, the larger x i. 125

2 Raoult's law. Used primarily for a component whose mole fraction approaches unity or for solutions of components quite similar in chemical nature, such as straight chain hydrocarbons. Let the subscript i denote the component, p i be the partial pressure of component i in the gas phase, y i be the gas-phase mole fraction, and x i be the liquid-phase mole fraction. Then: Note that in the limit where x i 1, p i p i. (13) Note that in the limit where x i 1, p i p i. Equilibrium constant K i is defined using Eq. (13.13) as follows by assuming that Dalton's law applies to the gas phase (p i = p t y i ): (14) Equation (14) gives reasonable estimates of K i values at low pressures for components well below their critical temperatures, but yields values too large for components above their critical temperatures, at high pressures, and/or for polar compounds. ubble Point Temperature ubble point: The temperature at which a liquid just starts to vaporize (See Figure 13.4). To calculate the bubble point temperature (given the total pressure and liquid composition), you can write Eq. (13.14) as y i = K i x i and you know that y i =1 in the vapor phase. n 1 (15) = K x i i i = 1 In which the K's are functions of solely the temperature and n is the number of components. For an ideal solution: (16) And you might use Anionie's equation for p i *. Once the bubble point temperature is determined, the vapor composition can be calculated from (17) Dew Point Temperature Dew Point: The temperature, at which the vapor just begins to condense at specified pressure, namely temperature values along the vapor pressure curve (See Figure 13.4). To calculate the dew point temperature (given the total pressure and vapor composition), you can write Eq. (13.14) as x i = y i /K i and you know x i =1 in the liquid phase. Consequently, you want to solve the equation 126

3 (18) In which the K's are function of temperature as explained for the bubble point temperature calculation. For an ideal solution, (19) Example 13 A gas containing nitrogen, benzene, and toluene is in equilibrium with 40 mole% benzene and 60 mole% toluene liquid mixtures at 100 o C and 10 atm. Estimate the gas phase composition (mole fractions) using Raoult s law. Antoine equation constants A C Pressure (mm Hg) enzene Temperature (K) Toluene Solution ln p * = A p C + T * = Exp mm Hg = p * T = Exp = 553.8mm Hg Raoult s law p i = p i * x i, and p i = y i p T y p T = x p * y y T = = (10)(760) = = 0.044, (10)(760) y N 2 = = Example 14 Air and liquid water are contained at equilibrium in a closed chamber at 75 C and 760 mm Hg. Calculate the molar composition of the gas phase. p H2O (75 C) = 289 mm Hg Solution Since the gas and liquid are in equilibrium, the air must be saturated with water vapor (if it was not, more water would evaporate), so that Raoult's law may be applied: 127

4 Example 15 Use either Raoult's law or Henry's law to solve the following problems. 1. A gas containing 1.00 mole% ethane is in contact with water at 20.0 C and 20.0 atm. Estimate the mole fraction of dissolved ethane. 2. An equimolar liquid mixture of benzene () and toluene (T) is in equilibrium with its vapor at 30.0 C. What are the system pressure and the composition of the vapor? (Henry's law constant for ethane in water at 20 C as 2.63 x 10 4 atm/mole fraction) Solution 1. Hydrocarbons normally are relatively insoluble in water, so that the solution of ethane is probably extremely dilute. Let us therefore apply Henry's law. 2. Since benzene and toluene are structurally similar compounds, we may apply Raoult's law. * ln p = A C + T Gibb's phase rule The rule can be applied only to systems in equilibrium. F = C P + 2 (20) Where F = number of degrees of freedom (i.e., the number of independent properties that have to be specified to determine all the intensive properties of each phase of the system of interest). C = number of components in the system. P = number of phases that can exist in the system; a phase is a homogeneous quantity of material such as a gas, a pure liquid, a solution, or a homogeneous solid. 128

5 Example 16 Calculate the number of degrees of freedom (how many additional intensive variables must be specified to fix the system) from the phase rule for the following materials at equilibrium: (a) Pure liquid benzene. (b) A mixture of ice and water only. (c) A mixture of liquid benzene, benzene vapor, and helium gas. (d) A mixture of salt and water designed to achieve a specific vapor pressure. What variables might be specified in each case? Solution F = C P + 2 (a) C = 1, P = 1, hence F = = 2. The temperature and pressure might be specified in the range in which benzene remains a liquid. (b) C = 1, P = 2, hence F = = 1. Once either the temperature or the pressure is specified, the other intensive variables are fixed. (c) C = 2, P = 2, hence F = = 2. A pair from temperature, pressure, or mole fraction can be specified. (d) C = 2, P = 2, hence F = = 2. Since a particular pressure is to be achieved, you would adjust the salt concentration and the temperature of the solution. Note in (a) and (b) it would be unlikely that a vapor phase would not exist in practice, increasing P by 1 and reducing F by one. Problems 1. Calculate the volume in ft 3 of 10 lb mol of an ideal gas at 68 F and 30 psia. 2. A steel cylinder of volume 2 m 3 contains methane gas (CH 4 ) at 50 C and 250 kpa absolute. How many kilograms of methane are in the cylinder? 3. What is the value of the ideal gas constant R to use if the pressure is to be expressed in atm, the temperature in Kelvin, the volume in cubic feet, and the quantity of material in pound moles? 4. Twenty-two kilograms per hour of CH 4 are flowing in a gas pipeline at 30 C and 920 mm Hg. What is the volumetric flow rate of the CH 4 in m 3 per hour? 5. What is the density of a gas that has a molecular weight of kg/kg mol at 300 K and 1000 kpa? 6. What is the specific gravity of CH 4 at 70 F and 2 atm compared to air at S.C.? 7. A gas has the following composition at 120 F and 13.8 psia. Component Mol % N 2 2 CH 4 79 C 2 H 6 19 (a) What is the partial pressure of each component? (b) What is the volume fraction of each component? 129

6 8. (a) If the C 2 H 6 were removed from the gas in problem 7, what would be the subsequent pressure in the vessel? (b) What would be the subsequent partial pressure of the N 2? 9. What is the ideal critical volume? What is the advantage of using V ci? 10. A carbon dioxide fire extinguisher has a volume of 40 L and is to be charged to a pressure of 20 atm at a storage temperature of 20 C. Determine the mass in kilograms of CO 2 at 1 atm. 11. Calculate the pressure of 4 g mol CO 2 contained in a 6.25 x 10-3 m 3 fire extinguisher at 25 C. 12. You measure that lb mol of a certain gas occupies a volume of 0.95 ft 3 at 1 atm and 32 F. If the equation of state for this gas is pv = nrt(1 + bp), where b is a constant, find the volume at 2 atm and 71 F. 13. Calculate the temperature of 2 g mol of a gas using van der Waals' equation with a = 1.35 * l0-6 m 6 (atm)(g mol - 2 ), b = * l0-3 (m 3 )(g mol -1 ) if the pressure is 100 kpa and the volume is m Calculate the pressure of 10 kg mol of ethane in a 4.86 m 3 vessel at 300 K using two equations of state: (a) ideal gas and (b) Soave-Redlich-Kwong. Compare with your answer the observed value of 34.0 atm. 15. One pound mole of a mixture containing lb mol of N 2 and lb mol C 2 H 4 at 50 C occupies a volume of 1.44 ft 3. What is the pressure in the vessel? Compute your answer by Kay's method. 16. Use the Antoine equation to calculate the vapor pressure of ethanol at 50 C, and compare with the experimental value (Experimental p * = mm Hg) 17. What does the term "saturated gas" mean? 18. If a container with a volumetric ratio of air to liquid water of 5 is heated to 60 C and equilibrium is reached, will there still be liquid water present? at 125 C? 19. A mixture of air and benzene contains 10 mole% benzene at 43 C and 105 kpa pressure. At what temperature does the first liquid form? What is the liquid? 20. The dew point of water in atmospheric air is 82 F. What is the mole fraction of water vapor in the air if the barometric pressure is 750 mm Hg? 21. Ten pounds of KClO 3 is completely decomposed and the oxygen evolved collected over water at 80 F. The barometer reads 29.7 in. Hg. What weight of saturated oxygen is obtained? 22. If a gas is saturated with water vapor, describe the state of the water vapor and the air if it is: (a) Heated at constant pressure. (b) Cooled at constant pressure. (c) Expanded at constant temperature. (d) Compressed at constant temperature. 23. Calculate (a) the pressure at the dew point for the following mixture at 100 F and (b) the liquid composition. 130

7 K values at psia of Component Mole fraction C 2 H C 3 H i-c 4 H n- C 4 H Total Is the critical point a single phase? If not, what phases are present? Repeat for the triple point (for water). 25. A vessel contains air: N 2 (g), O 2 (g), and Ar (g). (a) How many phases, components, and degrees of freedom are there according to the phase rule? (b) Repeat for a vessel one-third filled with liquid ethanol and two-thirds filled with N 2 plus ethanol vapor. Answers: ft kg m 3 /hr kg/m (lb CH 4 /ft 3 at 70 F and 2 atm)/ (lb air/ ft 3 at S.C.) 7. N 2, 0.28 psia; CH 4, 10.9 psia; C 2 H 6, 2.62 psia 8. (a) psia at 2 ft 3 and 120 F; (b) 0.28 psia at 2 ft 3 and 120 F 9. V ci = R T c /P c. It can be used to calculate V ri, which is a parameter on the Nelson and Obert charts kg atm 12. V = 0.60 ft K 14. (a) 50.7 atm; (b) 34.0 atm atm 16. predicted mm Hg 17. The partial pressure of the vapor equals the vapor pressure of the gas. Liquid and vapor are in equilibrium. 18. Yes; yes C; benzene lb 131

8 22. (a) oth gas; (b) some liquid water, residual is gas; (c) both gas; (d) some liquid water, residual is gas psia; C 2 H 6 = , C 3 H 8 = 0.66, i-c 4 H 10 = , n- C 4 H 10 = No, gas and liquid in equilibrium. The triple point in the p T projection in actually a line on the p V T surface. The pressure and temperature are fixed but the volume is not fixed. 25. (a) C = 3, P = 1, F = 4; (b) C = 2, P = 2, F = 2 132

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