Download SGBAU B-Tech 7th Sem FPOPC Petro Mass Transfer Question Paper

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B.Tech. Seventh Semester

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11056 : Mass Transfer : 7 CT 01
AW -3388
Pages: 3
Time : Three Hours Max. Marks : 80

Notes:

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1. Answer three questions from Section A and three questions from Section B.
2. Due credit will be given to neatness and adequate dimensions.
3. Assume suitable data wherever necessary.
4. Diagrams and chemical equations should be given wherever necessary.
5. Illustrate your answer with the help of neat sketches.

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6. Use of pen Blue/Black ink/refill only for writing the answer book.

SECTION - A

1. Explain the mechanism of absorption based on two film theory of mass transfer.
2. Gas from a petroleum distillation, has its concentration of H₂S reduced from 0.03 Kmol H₂S per Kmol of inert hydrocarbon gas to 0.1%. of this value by scrubbing with triethanolamine water in a counter current tower operating at 300K and at atmospheric pressure. The equilibrium relation for the solution may be taken as Y =2X. The solvent enters the tower free of H₂S and leaves containing 0.013 Kmol of H₂S per Kmol of solvent. If the flow of inert gas is 0.015 kmol/ m² -sec of tower cross section, estimate height of absorber and the number of transfer units (N_OG). The overall coefficient for absorption K_Ga may be taken as 0.04 Kmol/ m² -sec- Unit driving force.
   OR
   

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   Discuss interphase mass transfer between gas and liquid phase and the overall mass transfer coefficient.
3. Explain the concept of HETP and HTU in continuous equipment for absorption and how to estimate the total height of the absorption column, when the equilibrium curve is a straight line.
4. What is differential distillation? Derive an expression for Rayleigh’s equation.
5. Explain McCabe-Thiele method to determine number of theoretical plates in a distillation column.
   OR
   

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   Why reflux ratio is necessary in fractionation? Explain its importance. Discuss the effect of feed temperature on the number of plates in a distillation column. Develop expression for ‘q’ line and indicate the effect on number of plates in terms of ‘q’.

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6. Explain the types of ternary liquid-liquid extraction.
7. Explain the different types of membranes and the application of membrane separation in paper industries.
   OR
   Acetaldehyde (5%) is in solution in toluene and is to be extracted with water in a five stage co-current unit. If 25kg of water is used per 100kg feed, determine the amount of acetaldehyde extracted and the final concentration. The equilibrium relation for the system is given as: Y = 2.22X Where Y- Kg of acetaldehyde/kg of water. X - kg of acetaldehyde/kg of toluene.

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8. How are membranes characterized and discuss the application of membrane separation in biotechnology.

SECTION - B

9. What is leaching and discuss the parameters on which rate of leaching depends? Derive an expression for the ‘fraction unextracted’ for single stage multi contact washing system of insoluble solids retaining sufficient solute in it.
   OR
   What is the criteria of solvent selection in solid-liquid extraction? Explain.

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10. A plant produces 100kg/sec of titanium dioxide (TiO₂) pigment which must be 99.9% pure when dried. The pigment is produced by precipitation and the material as prepared is contaminated with Tkg of salt solution containing 0.55kg of salt per kg of pigment. The material is washed counter currently with water in a number of thickeners arranged in series. How many thickness will be required if water is added at a rate of 200 kg/sec and the solid discharged from each thickener removes 0.5kg of solvent per kg of pigment.
11. Explain Mier’s supersaturation criteria and nucleation in crystallization process. What will be the yield of Na₂S₂O₃ · 5H₂O if 100kg of 48% solution of Na₂S₂O₃ are cooled to 20°C. The solubility of Na₂S₂O₃ at 20°C is 70 parts per 100 parts of water. Molecular weight of Na₂S₂O₃ =158.
    OR
    How crystal growth occurs? What are the parameters which can affect the crystal growth?
12. Discuss the classification of crystallization equipments and explain the operation of any one.

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11. a) How to calculate drying rate and falling rate period?
    b) Explain the operation of a rotary dryer and its design procedure.
    OR
12. a) Test drying of food was carried out in an insulated tray. The temperature of the drying air was 60°C and the dew point 20°C. The dry weight of the material was 3.765kg and the surface area 0.186m². Test data are: Data: Weight of humid material at different drying time.
    

    t hrs.	0	0.4	0.8	1.4	2.2	3.0	4.2	5.0	7.0	9.0	12.0	25.0
    weight (kg)	4.94	4.88	4.8	4.67	4.55	4.4	4.21	4.15	4.09	3.97	3.955	3.955

    Determine the equilibrium moisture content and the drying rate as a function of moisture content in both rates.
    

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    b) What are the various theories of drying? Explain in details.

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