Code No: R05312301 R05 Set No. 2
III B.Tech I Semester Supplementary Examinations,June 2010
BIOCHEMICAL REACTION ENGINEERING Bio-Technology
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) What are the advantages of continuous bioreactors over batch bioreactors? (b) If a continuous bioreactor has so many advantages over batch bioreactors, why
are they not widely used in industry? [16]
2. The rates for two different gas-phase reactions at 1028 0 C are given by
r1 = 670 C 2
measured in metric (MKS units)
r2 = 8388 C 0.5 CB measured in English units with time in hours
Which reaction is more greatly influenced by
(a) a change in temperature,
(b) a change in pressure? [16]
3. How do you control the Cascade bioreactors? Explain in detail using mathematical model. [16]
4. Define the "selectivity parameter" in parallel reactions. Explain the various possi- bilities of parallel reactions. Recommend a suitable flow reactor for each. [16]
5. What does a "dispersion number" mean? What is its importance in non-ideal flow bioreactors? [16]
6. The activation energy of a chemical reaction is 17982 cal/mol in the absence of a catalyst, and 11980 cal/mol with a catalyst. By how many times will the rate of the reaction grow in the presence of a catalyst, if a reaction proceeds at 25 0C? [16]
7. At present 90% of reactant A is converted into product by a second order reaction in a single mixed flow reactor. We plan to place a second reactor similar to the one being used in series with it.
(a) For the same treatment rate as that used at present, how will this addition affect the conversion of reactant?
(b) For the same 90% conversion, by how much can the treatment rate be in- creased? [16]
8. (a) Derive an expression for the average residence time for a CSTR incorporating
Michaelis - Menten kinetics.
(b) Describe the fluid mechanics aspects you need to consider in the design of bioreactors. [16]
? ? ? ? ?
1
Code No: R05312301 R05 Set No. 4
III B.Tech I Semester Supplementary Examinations,June 2010
BIOCHEMICAL REACTION ENGINEERING Bio-Technology
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Define the "selectivity parameter" in parallel reactions. Explain the various possi- bilities of parallel reactions. Recommend a suitable flow reactor for each. [16]
2. (a) Derive an expression for the average residence time for a CSTR incorporating
Michaelis - Menten kinetics.
(b) Describe the fluid mechanics aspects you need to consider in the design of bioreactors. [16]
3. At present 90% of reactant A is converted into product by a second order reaction in a single mixed flow reactor. We plan to place a second reactor similar to the one being used in series with it.
(a) For the same treatment rate as that used at present, how will this addition affect the conversion of reactant?
(b) For the same 90% conversion, by how much can the treatment rate be in- creased? [16]
4. How do you control the Cascade bioreactors? Explain in detail using mathematical model. [16]
5. The activation energy of a chemical reaction is 17982 cal/mol in the absence of a catalyst, and 11980 cal/mol with a catalyst. By how many times will the rate of the reaction grow in the presence of a catalyst, if a reaction proceeds at 25 0C? [16]
6. (a) What are the advantages of continuous bioreactors over batch bioreactors? (b) If a continuous bioreactor has so many advantages over batch bioreactors, why
are they not widely used in industry? [16]
7. What does a "dispersion number" mean? What is its importance in non-ideal flow bioreactors? [16]
8. The rates for two different gas-phase reactions at 1028 0 C are given by
r1= 670 C 2
measured in metric (MKS units)
r2= 8388 C 0.5 CB measured in English units with time in hours
Which reaction is more greatly influenced by
(a) a change in temperature,
(b) a change in pressure? [16]
? ? ? ? ?
2
Code No: R05312301 R05 Set No. 1
III B.Tech I Semester Supplementary Examinations,June 2010
BIOCHEMICAL REACTION ENGINEERING Bio-Technology
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) What are the advantages of continuous bioreactors over batch bioreactors? (b) If a continuous bioreactor has so many advantages over batch bioreactors, why
are they not widely used in industry? [16]
2. The rates for two different gas-phase reactions at 1028 0 C are given by
r1 = 670 C 2
measured in metric (MKS units)
r2 = 8388 C 0.5 CB measured in English units with time in hours
Which reaction is more greatly influenced by
(a) a change in temperature,
(b) a change in pressure? [16]
3. How do you control the Cascade bioreactors? Explain in detail using mathematical
model. [16]
4. The activation energy of a chemical reaction is 17982 cal/mol in the absence of a catalyst, and 11980 cal/mol with a catalyst. By how many times will the rate of the reaction grow in the presence of a catalyst, if a reaction proceeds at 25 0C? [16]
5. What does a "dispersion number" mean? What is its importance in non-ideal flow bioreactors? [16]
6. (a) Derive an expression for the average residence time for a CSTR incorporating
Michaelis - Menten kinetics.
(b) Describe the fluid mechanics aspects you need to consider in the design of
bioreactors. [16]
7. At present 90% of reactant A is converted into product by a second order reaction in a single mixed flow reactor. We plan to place a second reactor similar to the one being used in series with it.
(a) For the same treatment rate as that used at present, how will this addition
affect the conversion of reactant?
(b) For the same 90% conversion, by how much can the treatment rate be in-
creased? [16]
8. Definethe"selectivityparameter"inparallelreactions.Explainthevariouspossi-
bilities of parallel reactions. Recommend a suitable flow reactor for each. [16]
3
Code No: R05312301 R05 Set No. 1
? ? ? ? ?
4
Code No: R05312301 R05 Set No. 3
III B.Tech I Semester Supplementary Examinations,June 2010
BIOCHEMICAL REACTION ENGINEERING Bio-Technology
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. The rates for two different gas-phase reactions at 1028 0 C are given by
r1 = 670 C 2
measured in metric (MKS units)
r2 = 8388 C 0.5 CB measured in English units with time in hours
Which reaction is more greatly influenced by
(a) a change in temperature,
(b) a change in pressure? [16]
2. The activation energy of a chemical reaction is 17982 cal/mol in the absence of a catalyst, and 11980 cal/mol with a catalyst. By how many times will the rate of the reaction grow in the presence of a catalyst, if a reaction proceeds at 25 0C? [16]
3. How do you control the Cascade bioreactors? Explain in detail using mathematical
model. [16]
4. At present 90% of reactant A is converted into product by a second order reaction in a single mixed flow reactor. We plan to place a second reactor similar to the one being used in series with it.
(a) For the same treatment rate as that used at present, how will this addition affect the conversion of reactant?
(b) For the same 90% conversion, by how much can the treatment rate be in-
creased? [16]
5. (a) What are the advantages of continuous bioreactors over batch bioreactors?
(b) If a continuous bioreactor has so many advantages over batch bioreactors, why
are they not widely used in industry? [16]
6. (a) Derive an expression for the average residence time for a CSTR incorporating
Michaelis - Menten kinetics.
(b) Describe the fluid mechanics aspects you need to consider in the design of bioreactors. [16]
7. Definethe"selectivityparameter"inparallelreactions.Explainthevariouspossi-
bilities of parallel reactions. Recommend a suitable flow reactor for each. [16]
8. What does a "dispersion number" mean? What is its importance in non-ideal flow bioreactors? [16]
5
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