1. Partially Miscible & Immiscible Solutions Contributions by: John L. Falconer & Will Medlin Department of Chemical and Biological Engineering University of Colorado Boulder, CO 80309-0424 Supported by the National Science Foundation

2. Point 1 on the VLE curve represents a liquid (  ) that is enriched in component 1. What do points 2, 3, and 4 represent? A.Two liquids, L(  ) + V, two liquids B.Two liquids, L(  ) & V, liquid  C.Miscible liquid, V & L, liquid  Pressure 180 120 60 01.00.5 x 1, y 1 1 2 5 6 3 4

3. Point 1 on the VLE curve represents a liquid (  ) that is enriched in component 1. What does point 5 not represent? A.Liquids  &  B.Liquids  &  and vapor C.Liquid  and vapor D.Liquid  and vapor E.Represents all of these Pressure 180 120 60 01.00.5 x 1, y 1 1 2 5 6 3 4

4. Point 1 on the VLE curve represents a liquid (  ) that is enriched in component 1. Point 5 could represent _______. A.Liquids  &  B.Liquid  & vapor C.Two liquids and vapor D.None of these Pressure 180 120 60 01.00.5 x 1, y 1 1 2 5 6 3 4

5. Point 1 on the VLE curve represents a liquid (  ) that is enriched in component 1. Point 6 could represent _______. A.Liquids  & , and vapor B.Two liquids C.Two vapors and liquid  D.None of these Pressure 180 120 60 01.00.5 x 1, y 1 1 2 5 6 3 4

6. The equilibrium state for the B/H 2 O system at 25°C: 1)An aqueous phase with x B = 0.000097 2)An organic phase with x H 2 O = 0.00094 What is the activity of B in the aqueous phase? A.Cannot determine without activity coefficients B.0.00094 C.1.0 D.0.000097 B phase H 2 O phase

7. A piston-cylinder contains 1 mol n-hexane (C 6 ) in VLE. At 70°C and 1 bar, 2 mol H 2 O (l) is added while temperature and pressure are held constant. What is the equilibrium state of the system? (Note: H 2 O and C 6 are immiscible) A.All vapor B.All liquid (2 liquids) C.Liquid C 6 and H 2 O, and C 6 in vapor D.Liquid H 2 O, and C 6 and H 2 O in vapor E.Liquid C, and H 2 O and C 6 in gas phase

8. A piston-cylinder contains 2 mol n-hexane (C 6 ) in VLE. At 70°C and 1 bar, 0.2 mol H 2 O (l) is added while temperature and pressure are held constant. What is the equilibrium state of the system? (Note: H 2 O and C 6 are immiscible) A.All vapor B.All liquid (2 liquids) C.Liquid C 6 and H 2 O, and C 6 in vapor D.Liquid H 2 O, and C 6 and H 2 O in vapor E.Liquid C, and H 2 O and C 6 in gas phase

9. A fixed volume container has1 mol n-C 6 (hexane) in VLE. At 60°C and 1 bar, 0.2 mol H 2 O (l) is added. What is the equilibrium state of the system at 60°C ? (Note: H 2 O and n-C 6 are immiscible) A.All vapor B.All liquid (2 liquids) C.Liquid n-C 6, and n-C 6 & H 2 O in vapor D.Liquid H 2 O and n-C 6, and n-C 6 and H 2 O in vapor Hexane 0.2 mol H 2 O (l)

10. A fixed volume container has1 mol n-C 6 (hexane) in VLE. At 60°C and 1 bar, 0.2 mol H 2 O (l) is added. What is the equilibrium state of the system at 60°C ? (Note: H 2 O and n-C 6 are immiscible) A.All vapor B.All liquid (2 liquids) C.Liquid n-C 6, and n-C 6 & H 2 O in vapor D.Liquid H 2 O and n-C 6, and n-C 6 and H 2 O in vapor Hexane 0.2 mol H 2 O (l)

11. Two components are in the vapor phase. You raise the pressure and one component condenses. What can you conclude? A.The liquids are immiscible B.The liquid that condensed had the lower vapor pressure C.The liquid that condensed had the higher vapor pressure

12. 6 mol of A and 4 mol of B are in equilibrium at 100°C and 3 bar. A and B are completely immiscible in the liquid phase. Their vapor pressures at 100°C are: What phases are present? A.Liquid B and vapor of A + B B.Two liquids C.Two liquids in equilibrium with vapor D.All vapor E.Liquid A and vapor of A + B P B sat = 0.5 bar P A sat = 2.0 bar

13. 6 mol of A and 4 mol of B are in equilibrium at 100°C and 2 bar. A and B are completely immiscible in the liquid phase. Their vapor pressures at 100°C are: What phases are present? A.Liquid B and vapor of A + B B.Two liquids C.Two liquids in equilibrium with vapor D.All vapor E.Liquid A and vapor of A + B P B sat = 0.5 bar P A sat = 2.0 bar

14. A gas phase mixture at 100°C is 75% A and 25% B. As pressure increases isothermally, liquid A starts to condense at 1.6 bar. At 2.4 bar, liquid B starts to condense. What are the vapor pressures of A and B? A.P A sat = 1.6 bar, P B sat = 2.4 bar B.P A sat = 1.2 bar, P B sat = 1.6 bar C.P A sat = 1.6 bar, P B sat = 1.2 bar D.P A sat = 1.8 bar, P B sat = 0.6 bar E.P A sat = 1.2 bar, P B sat = 1.2 bar

15. A gas phase mixture at 120°C is 60% A and 40% B. As pressure increases isothermally, liquid A starts to condense at 1.5 bar. At 3.0 bar, liquid B starts to condense. What are the vapor pressures of A and B? A.P A sat = 1.5 bar, P B sat = 3.0 bar B.P A sat = 1.5 bar, P B sat = 1.5 bar C.P A sat = 0.9 bar, P B sat = 3.0 bar D.P A sat = 0.9 bar, P B sat = 2.1 bar E.P A sat = 1.8 bar, P B sat = 0.6 bar

16. A binary gas mixture of A and B has y A = 0.6. When the pressure of this gas is raised to 2.0 bar, component A condenses, but component B does not. Which statement is correct? A.P A sat = 1.2 bar, P B sat = 0.8 bar B.P A sat = 1.2 bar, P B sat = 2.0 bar C.P A sat = 1.2 bar, P B sat > 0.8 bar D.P A sat = 2.0 bar, P B sat > 0.8 bar E.P A sat = 2.0 bar, P B sat = 0.8 bar

17. Liquids A and B are completely immiscible. The saturation pressure at 70°C is 0.8 bar for A and 0.6 bar for B. What partial pressures of the vapor will have a dew point at 70°C at 1.0 bar? A.P A = 0.8 bar, P B =0.2 bar B.P A = 0.5 bar, P B =0.5 bar C.P A = 0.4 bar, P B =0.6 bar D.Both A and B E.Both A and C

18. Liquids A and B are completely immiscible. The saturation pressure at 70°C is 0.8 bar for A and 0.6 bar for B. What composition(s) of vapor will have a dew point at 70°C at 1.0 bar? A.y A = 0.8 B.y A = 0.5 C.y A = 0.4 D.y A = 0.4 & y A = 0.8 E.y A = 0.5 & y A = 0.8

19. Liquids A and B are completely immiscible. The saturation pressure at 70°C for A is 0.8 bar and for B is 0.6 bar. Pressure = 1.0 bar. What composition(s) of vapor will have a dew point at 70°C? A.P A = 0.8 bar, P B = 0.2 bar B.P A = 0.5 bar, P B = 0.5 bar C.P A = 0.4 bar, P B = 0.6 bar D.Both A and C E.None of the above