Code No: RR310802 RR Set No. 2
III B.Tech I Semester Supplementary Examinations,June 2010
CHEMICAL ENGINEERING THERMODYNAMICS-II Chemical Engineering
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Prove that for a stable phase, the fugacity of each species of a binary system always increase with the composition. [16]
2. The following data for isobaric VLE data for the system methanol
(a) -nitromethane
(b) at 760 Torr has been experimentally determined by Nakanishi et al. Determine the parameters of the van Laar equation for the system. Calculate t − x − y data for the system at 760 Torr from the van Laar parameters and compare the results with the experimental data.
| T(C) | x1 | y1 |
| 96.90 | 0.0150 | 0.1330 |
| 68.20 | 0.4260 | 0.7470 |
| 65.10 | 0.7470 | 0.8380 |
| 64.50 | 0.9140 | 0.9210 |
The Antoine constants are given by
| Components | A | B | C |
| Methanol(1) | 6.87987 | 1196.760 | 219.161 |
| Nitromethane(2) | 6.89386 | 1264.370 | 216.640 |
The Antoine equation is given by log10 P = A - B
, P in torr, t in 0C. [16]
3. (a) Explain the standard free energy change for any reaction.
(b) Determine the equilibrium constant at 250C for the reaction.
C2H4 (g) + H2O(1) → C O(g) + 3H2 (g)
Data:
Component ∆0Gf at 250C
CO (g) − 137.8 KJ / mol
C H4(g) − 50.09 KJ / mol
H2O (l) − 238 KJ / mol. [8+8]
4. Explain briefly the estimation procedure of thermodynamics properties from cubic equations of state along with equations. [16]
1
Code No: RR310802 RR Set No. 2
5. Calculate the standard heat of the methanol-synthesis reaction at 8000C.
C O(g) + 2H (g) C H OH (g)
Cp/R = A + BT + C T 2 + D/T 2 [16]
Data:
6. A single effect Evaporator operating at atmospheric pressure concentrates a 15% (by weight) LiCl solution to 40%. The feed enters the evaporator at the rate of 2 kg / sec at 250C. The normal boiling point of a 40% LiCl solution is about 1320C, its specific heat is estimated as 2.72 kJ / kg 0C. What is the heat transfer rate in the evaporator? Latent heat of water is 540 cal/gm. [16]
7. (a) Define the term fugacity. Why it is essential to introduce this term in Engi- neering thermodynamics? What are its units?
(b) Discuss the graphical method to determine the fugacity of any gas.
(c) Utilize the following data to calculate the fugacities of nitrogen gas at the various pressures at 00 C. [4+4+8]
| P | 50 | 100 | 200 | 400 | 800 | 1000 | Atm |
| PV/RT | 0.9846 | 0.9846 | 1.0365 | 1.2557 | 1.7959 | 2.0641 |
|
8. (a) Characterize ideal solutions.
(b) Two substances A and B are known to form ideal solution. An equimolar vapor mixture of A and B initially at 100 C and 100 Kpa is isothermally compressed till the mixture condenses. Determine the pressures at which condensation begins and terminates and also the compositions of the vapor and liquid phases. The saturation pressures of A and B at 100 C are 120 Kpa and 150 Kpa, respectively. [6+10]
? ? ? ? ?
2
Code No: RR310802 RR Set No. 4
III B.Tech I Semester Supplementary Examinations,June 2010
CHEMICAL ENGINEERING THERMODYNAMICS-II Chemical Engineering
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Explain the standard free energy change for any reaction.
(b) Determine the equilibrium constant at 250C for the reaction.
C2H4 (g) + H2O(1) → C O(g) + 3H2 (g)
Data:
Component ∆0Gf at 250C
CO (g) − 137.8 KJ / mol
C H4(g) − 50.09 KJ / mol
H2O (l) − 238 KJ / mol. [8+8]
2. A single effect Evaporator operating at atmospheric pressure concentrates a 15% (by weight) LiCl solution to 40%. The feed enters the evaporator at the rate of 2 kg / sec at 250C. The normal boiling point of a 40% LiCl solution is about 1320C, its specific heat is estimated as 2.72 kJ / kg 0C. What is the heat transfer rate in the evaporator? Latent heat of water is 540 cal/gm. [16]
3. The following data for isobaric VLE data for the system methanol
(a) -nitromethane
(b) at 760 Torr has been experimentally determined by Nakanishi et al. Determine the parameters of the van Laar equation for the system. Calculate t − x − y data for the system at 760 Torr from the van Laar parameters and compare the results with the experimental data.
| T(C) | x1 | y1 |
| 96.90 | 0.0150 | 0.1330 |
| 68.20 | 0.4260 | 0.7470 |
| 65.10 | 0.7470 | 0.8380 |
| 64.50 | 0.9140 | 0.9210 |
The Antoine constants are given by
| Components | A | B | C |
| Methanol(1) | 6.87987 | 1196.760 | 219.161 |
| Nitromethane(2) | 6.89386 | 1264.370 | 216.640 |
The Antoine equation is given by log10 P = A - B
, P in torr, t in 0C. [16]
4. Explain briefly the estimation procedure of thermodynamics properties from cubic equations of state along with equations. [16]
3
Code No: RR310802 RR Set No. 4
5. Calculate the standard heat of the methanol-synthesis reaction at 8000C.
C O(g) + 2H (g) C H OH (g)
Cp/R = A + BT + C T 2 + D/T 2 [16]
Data:
6. (a) Define the term fugacity. Why it is essential to introduce this term in Engi- neering thermodynamics? What are its units?
(b) Discuss the graphical method to determine the fugacity of any gas.
(c) Utilize the following data to calculate the fugacities of nitrogen gas at the various pressures at 00 C. [4+4+8]
| P | 50 | 100 | 200 | 400 | 800 | 1000 | Atm |
| PV/RT | 0.9846 | 0.9846 | 1.0365 | 1.2557 | 1.7959 | 2.0641 |
|
7. Prove that for a stable phase, the fugacity of each species of a binary system always increase with the composition. [16]
8. (a) Characterize ideal solutions.
(b) Two substances A and B are known to form ideal solution. An equimolar vapor mixture of A and B initially at 100 C and 100 Kpa is isothermally compressed till the mixture condenses. Determine the pressures at which condensation begins and terminates and also the compositions of the vapor and liquid phases. The saturation pressures of A and B at 100 C are 120 Kpa and 150 Kpa, respectively. [6+10]
? ? ? ? ?
4
Code No: RR310802 RR Set No. 1
III B.Tech I Semester Supplementary Examinations,June 2010
CHEMICAL ENGINEERING THERMODYNAMICS-II Chemical Engineering
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Explain briefly the estimation procedure of thermodynamics properties from cubic equations of state along with equations. [16]
2. (a) Explain the standard free energy change for any reaction.
(b) Determine the equilibrium constant at 250C for the reaction.
C2H4 (g) + H2O(1) → C O(g) + 3H2 (g)
Data:
Component ∆0Gf at 250C
CO (g) − 137.8 KJ / mol
C H4(g) − 50.09 KJ / mol
H2O (l) − 238 KJ / mol. [8+8]
3. Prove that for a stable phase, the fugacity of each species of a binary system always increase with the composition. [16]
4. (a) Define the term fugacity. Why it is essential to introduce this term in Engi- neering thermodynamics? What are its units?
(b) Discuss the graphical method to determine the fugacity of any gas.
(c) Utilize the following data to calculate the fugacities of nitrogen gas at the various pressures at 00 C. [4+4+8]
| P | 50 | 100 | 200 | 400 | 800 | 1000 | Atm |
| PV/RT | 0.9846 | 0.9846 | 1.0365 | 1.2557 | 1.7959 | 2.0641 |
|
5. Calculate the standard heat of the methanol-synthesis reaction at 8000C.
C O(g) + 2H (g) C H OH (g)
Cp/R = A + BT + C T 2 + D/T 2 [16]
Data:
6. (a) Characterize ideal solutions.
(b) Two substances A and B are known to form ideal solution. An equimolar vapor mixture of A and B initially at 100 C and 100 Kpa is isothermally compressed till the mixture condenses. Determine the pressures at which
5
Code No: RR310802 RR Set No. 1
condensation begins and terminates and also the compositions of the vapor and liquid phases. The saturation pressures of A and B at 100 C are 120 Kpa and 150 Kpa, respectively. [6+10]
7. The following data for isobaric VLE data for the system methanol
(a) -nitromethane
(b) at 760 Torr has been experimentally determined by Nakanishi et al. Determine the parameters of the van Laar equation for the system. Calculate t − x − y data for the system at 760 Torr from the van Laar parameters and compare the results with the experimental data.
| T(C) | x1 | y1 |
| 96.90 | 0.0150 | 0.1330 |
| 68.20 | 0.4260 | 0.7470 |
| 65.10 | 0.7470 | 0.8380 |
| 64.50 | 0.9140 | 0.9210 |
The Antoine constants are given by
| Components | A | B | C |
| Methanol(1) | 6.87987 | 1196.760 | 219.161 |
| Nitromethane(2) | 6.89386 | 1264.370 | 216.640 |
The Antoine equation is given by log10 P = A - B
, P in torr, t in 0C. [16]
8. A single effect Evaporator operating at atmospheric pressure concentrates a 15% (by weight) LiCl solution to 40%. The feed enters the evaporator at the rate of 2 kg / sec at 250C. The normal boiling point of a 40% LiCl solution is about 1320C, its specific heat is estimated as 2.72 kJ / kg 0C. What is the heat transfer rate in the evaporator? Latent heat of water is 540 cal/gm. [16]
? ? ? ? ?
6
Code No: RR310802 RR Set No. 3
III B.Tech I Semester Supplementary Examinations,June 2010
CHEMICAL ENGINEERING THERMODYNAMICS-II Chemical Engineering
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Explain briefly the estimation procedure of thermodynamics properties from cubic equations of state along with equations. [16]
2. The following data for isobaric VLE data for the system methanol
(a) -nitromethane
(b) at 760 Torr has been experimentally determined by Nakanishi et al. Determine the parameters of the van Laar equation for the system. Calculate t − x − y data for the system at 760 Torr from the van Laar parameters and compare the results with the experimental data.
| T(C) | x1 | y1 |
| 96.90 | 0.0150 | 0.1330 |
| 68.20 | 0.4260 | 0.7470 |
| 65.10 | 0.7470 | 0.8380 |
| 64.50 | 0.9140 | 0.9210 |
The Antoine constants are given by
| Components | A | B | C |
| Methanol(1) | 6.87987 | 1196.760 | 219.161 |
| Nitromethane(2) | 6.89386 | 1264.370 | 216.640 |
The Antoine equation is given by log10 P = A - B
, P in torr, t in 0C. [16]
3. A single effect Evaporator operating at atmospheric pressure concentrates a 15% (by weight) LiCl solution to 40%. The feed enters the evaporator at the rate of 2 kg / sec at 250C. The normal boiling point of a 40% LiCl solution is about 1320C, its specific heat is estimated as 2.72 kJ / kg 0C. What is the heat transfer rate in the evaporator? Latent heat of water is 540 cal/gm. [16]
4. Prove that for a stable phase, the fugacity of each species of a binary system always increase with the composition. [16]
5. Calculate the standard heat of the methanol-synthesis reaction at 8000C.
C O(g) + 2H (g) C H OH (g)
Cp/R = A + BT + C T 2 + D/T 2 [16]
Data:
7
Code No: RR310802 RR Set No. 3
6. (a) Define the term fugacity. Why it is essential to introduce this term in Engi- neering thermodynamics? What are its units?
(b) Discuss the graphical method to determine the fugacity of any gas.
(c) Utilize the following data to calculate the fugacities of nitrogen gas at the various pressures at 00 C. [4+4+8]
| P | 50 | 100 | 200 | 400 | 800 | 1000 | Atm |
| PV/RT | 0.9846 | 0.9846 | 1.0365 | 1.2557 | 1.7959 | 2.0641 |
|
7. (a) Characterize ideal solutions.
(b) Two substances A and B are known to form ideal solution. An equimolar vapor mixture of A and B initially at 100 C and 100 Kpa is isothermally compressed till the mixture condenses. Determine the pressures at which condensation begins and terminates and also the compositions of the vapor and liquid phases. The saturation pressures of A and B at 100 C are 120 Kpa and 150 Kpa, respectively. [6+10]
8. (a) Explain the standard free energy change for any reaction.
(b) Determine the equilibrium constant at 250C for the reaction.
C2H4 (g) + H2 O(1) → C O(g) + 3H2 (g)
Data:
Component ∆0Gf at 250C
CO (g) − 137.8 KJ / mol
C H4(g) − 50.09 KJ / mol
H2O (l) − 238 KJ / mol. [8+8]
No comments:
Post a Comment