Code No: RR320801
RR
Set No. 2
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III B.Tech II Semester Examinations,December 2010 MASS TRANSFER OPERATION - II Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
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1. An aqueous solution containing a valuable solute is colored by small amounts of an impurity. Before crystallization, the impurity is to be removed by adsorption on a decolorizing carbon, which adsorbs only insignificant amounts of the principal solute. A series of laboratory tests was made by stirring various amounts of the adsorbent into batches of the original solution until equilibrium was established, yielding the following data at constant temperature:
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kg carbon/kg soln 0 0.001 0.004 0.008 0.02 0.04 Equilibrium color 9.6 8.1 6.3 4.3 1.7 0.7
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The color intensity was measured on an arbitrary scale, proportional to the concentration of the colored substance. It is desired to reduce the color to 10% of its original value, 9.6. Determine the quantity of fresh carbon required per 1000kg of solution for a single stage operation, for a two stage cross current process using the minimum total amount of carbon, and for a two stage counter current operation. [16] 2. By means of neat sketches, describe schematically, the different forms of reboiler arrangements in common use. [16] 3. (a) Explain typical equilibrium diagrams used in leaching operation. (b) Define distribution coefficient.
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(c) What is constant underflow?
[11+2+3]
4. (a) Describe the mixer - settler cascading system with a neat flow sheet of three stage counter mixer settler extraction to cascade. (b) Discuss about Podbielniak extractor with a neat sketch.
[10+6]
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5. A ten-plate distillation column with re-boiler and total condenser is available for use. An equimolar mixture of A and B at its boiling point is to be separated to get a distillate containing 90% A (mole%). The relative volatility of mixture is 2.6. Calculate: (a) minimum reflux ratio
(b) the yield of distillate and residue for R = 1.2.
[16]
6. (a) Draw a neat sketch of multistage cross current extraction unit and make the material balance by using solvant free coordinates ?
1
Code No: RR320801
RR
Set No. 2
(b) How do you estimate the quantity of extract by using single stage extraction? [8+8] 7. (a) Describe the process of ion exchange treatment in Higgins contactor with a schematic diagram. (b) Explain chromatographic separation of two solutes.
[10+6]
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8. (a) Generate X-Y and T-X-Y diagrams for an ideal solution of methanol-ethanol system from the data given below:
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Vapour pressure in mm Hg. 200 400 760 1520 0 T emperature C for ethanol 48.4 62.5 78.4 97.5 0 T emperature C for methanol 34.8 49.9 64.7 84
(b) Calculate and report the mean relative volatility for the above system. [12+4]
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or
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2
Code No: RR320801
RR
Set No. 4
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III B.Tech II Semester Examinations,December 2010 MASS TRANSFER OPERATION - II Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Explain typical equilibrium diagrams used in leaching operation. (b) Define distribution coefficient.
[11+2+3]
ld .
(c) What is constant underflow?
(a) minimum reflux ratio
or
2. A ten-plate distillation column with re-boiler and total condenser is available for use. An equimolar mixture of A and B at its boiling point is to be separated to get a distillate containing 90% A (mole%). The relative volatility of mixture is 2.6. Calculate:
(b) the yield of distillate and residue for R = 1.2.
[16]
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3. An aqueous solution containing a valuable solute is colored by small amounts of an impurity. Before crystallization, the impurity is to be removed by adsorption on a decolorizing carbon, which adsorbs only insignificant amounts of the principal solute. A series of laboratory tests was made by stirring various amounts of the adsorbent into batches of the original solution until equilibrium was established, yielding the following data at constant temperature: kg carbon/kg soln 0 0.001 0.004 0.008 0.02 0.04 Equilibrium color 9.6 8.1 6.3 4.3 1.7 0.7
Aj
nt
The color intensity was measured on an arbitrary scale, proportional to the concentration of the colored substance. It is desired to reduce the color to 10% of its original value, 9.6. Determine the quantity of fresh carbon required per 1000kg of solution for a single stage operation, for a two stage cross current process using the minimum total amount of carbon, and for a two stage counter current operation. [16]
4. By means of neat sketches, describe schematically, the different forms of reboiler arrangements in common use. [16] 5. (a) Generate X-Y and T-X-Y diagrams for an ideal solution of methanol-ethanol system from the data given below: Vapour pressure in mm Hg. 200 400 760 1520 0 T emperature C for ethanol 48.4 62.5 78.4 97.5 T emperature0 C for methanol 34.8 49.9 64.7 84
3
Code No: RR320801
RR
Set No. 4
(b) Calculate and report the mean relative volatility for the above system. [12+4] 6. (a) Describe the process of ion exchange treatment in Higgins contactor with a schematic diagram. (b) Explain chromatographic separation of two solutes.
[10+6]
(b) Discuss about Podbielniak extractor with a neat sketch.
in
7. (a) Describe the mixer - settler cascading system with a neat flow sheet of three stage counter mixer settler extraction to cascade. [10+6]
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8. (a) Draw a neat sketch of multistage cross current extraction unit and make the material balance by using solvant free coordinates ? (b) How do you estimate the quantity of extract by using single stage extraction? [8+8]
Aj
nt
uW
or
?????
4
Code No: RR320801
RR
Set No. 1
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III B.Tech II Semester Examinations,December 2010 MASS TRANSFER OPERATION - II Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. By means of neat sketches, describe schematically, the different forms of reboiler arrangements in common use. [16]
ld .
2. (a) Describe the process of ion exchange treatment in Higgins contactor with a schematic diagram. (b) Explain chromatographic separation of two solutes.
[10+6]
or
3. (a) Describe the mixer - settler cascading system with a neat flow sheet of three stage counter mixer settler extraction to cascade. (b) Discuss about Podbielniak extractor with a neat sketch.
[10+6]
uW
4. A ten-plate distillation column with re-boiler and total condenser is available for use. An equimolar mixture of A and B at its boiling point is to be separated to get a distillate containing 90% A (mole%). The relative volatility of mixture is 2.6. Calculate: (a) minimum reflux ratio
(b) the yield of distillate and residue for R = 1.2.
[16]
5. (a) Generate X-Y and T-X-Y diagrams for an ideal solution of methanol-ethanol system from the data given below:
nt
Vapour pressure in mm Hg. 200 400 760 1520 T emperature0 C for ethanol 48.4 62.5 78.4 97.5 T emperature0 C for methanol 34.8 49.9 64.7 84
Aj
(b) Calculate and report the mean relative volatility for the above system. [12+4]
6. (a) Explain typical equilibrium diagrams used in leaching operation. (b) Define distribution coefficient. (c) What is constant underflow?
[11+2+3]
7. (a) Draw a neat sketch of multistage cross current extraction unit and make the material balance by using solvant free coordinates ? (b) How do you estimate the quantity of extract by using single stage extraction? [8+8]
5
Code No: RR320801
RR
Set No. 1
8. An aqueous solution containing a valuable solute is colored by small amounts of an impurity. Before crystallization, the impurity is to be removed by adsorption on a decolorizing carbon, which adsorbs only insignificant amounts of the principal solute. A series of laboratory tests was made by stirring various amounts of the adsorbent into batches of the original solution until equilibrium was established, yielding the following data at constant temperature:
in
kg carbon/kg soln 0 0.001 0.004 0.008 0.02 0.04 Equilibrium color 9.6 8.1 6.3 4.3 1.7 0.7
Aj
nt
uW
or
?????
ld .
The color intensity was measured on an arbitrary scale, proportional to the concentration of the colored substance. It is desired to reduce the color to 10% of its original value, 9.6. Determine the quantity of fresh carbon required per 1000kg of solution for a single stage operation, for a two stage cross current process using the minimum total amount of carbon, and for a two stage counter current operation. [16]
6
Code No: RR320801
RR
Set No. 3
in
III B.Tech II Semester Examinations,December 2010 MASS TRANSFER OPERATION - II Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Draw a neat sketch of multistage cross current extraction unit and make the material balance by using solvant free coordinates ?
ld .
(b) How do you estimate the quantity of extract by using single stage extraction? [8+8]
2. (a) Describe the mixer - settler cascading system with a neat flow sheet of three stage counter mixer settler extraction to cascade. (b) Discuss about Podbielniak extractor with a neat sketch.
[10+6]
or
3. By means of neat sketches, describe schematically, the different forms of reboiler arrangements in common use. [16]
4. (a) Describe the process of ion exchange treatment in Higgins contactor with a schematic diagram.
uW
(b) Explain chromatographic separation of two solutes.
[10+6]
5. A ten-plate distillation column with re-boiler and total condenser is available for use. An equimolar mixture of A and B at its boiling point is to be separated to get a distillate containing 90% A (mole%). The relative volatility of mixture is 2.6. Calculate: (a) minimum reflux ratio
(b) the yield of distillate and residue for R = 1.2.
[16]
Aj
nt
6. An aqueous solution containing a valuable solute is colored by small amounts of an impurity. Before crystallization, the impurity is to be removed by adsorption on a decolorizing carbon, which adsorbs only insignificant amounts of the principal solute. A series of laboratory tests was made by stirring various amounts of the adsorbent into batches of the original solution until equilibrium was established, yielding the following data at constant temperature: kg carbon/kg soln 0 0.001 0.004 0.008 0.02 0.04 Equilibrium color 9.6 8.1 6.3 4.3 1.7 0.7
The color intensity was measured on an arbitrary scale, proportional to the concentration of the colored substance. It is desired to reduce the color to 10% of its original value, 9.6. Determine the quantity of fresh carbon required per 1000kg of solution for a single stage operation, for a two stage cross current process using the minimum total amount of carbon, and for a two stage counter current operation. [16] 7
Code No: RR320801
RR
Set No. 3
7. (a) Explain typical equilibrium diagrams used in leaching operation. (b) Define distribution coefficient. (c) What is constant underflow?
[11+2+3]
in
8. (a) Generate X-Y and T-X-Y diagrams for an ideal solution of methanol-ethanol system from the data given below: Vapour pressure in mm Hg. 200 400 760 1520 0 T emperature C for ethanol 48.4 62.5 78.4 97.5 T emperature0 C for methanol 34.8 49.9 64.7 84
Aj
nt
uW
or
?????
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(b) Calculate and report the mean relative volatility for the above system. [12+4]
8
