ELEMENTS OF CHEM. REACTION ENGR
5th Edition
ISBN: 9780135486498
Author: Fogler
Publisher: INTER PEAR
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Textbook Question
Chapter 5, Problem 5.10P
Troubleshooting
(a) A liquid-phase isomerization A → B is carried out in a 1000-gal CSTR that has a single impeller located halfway down the reactor. The liquid enters at the top of the reactor and exits at the bottom. The reaction is second order. Experimental data taken in a batch reactor predicted the CSTR conversion should be 50%. However, the conversion measured in the actual CSTR was 57%. Suggest reasons for the discrepancy and suggest something, e.g., a model, that would give closer agreement between the predicted and measured conversions. Back your suggestions with calculations. P.S. It was raining very hard that day.
(b) The liquid-phase reaction
A → B
was carried out in a CSTR. For an entering concentration of 2 mol/dm3, the conversion was 40%. For the same reactor volume and entering conditions as the CSTR, the expected PFR conversion is 48.6%. However, the PFR conversion was, amazingly, 52.6% exactly. Brainstorm reasons for the disparity. Quantitatively show how these conversions came about (i.e., the expected conversion and the actual conversion). Part (b) is C-level difficulty.
(c) The gas-phase reaction
A + B → C + D
is carried out in a packed-bed reactor. When the particle size was decreased by 15%, the conversion remained unchanged. When the particle size was decreased by 20%, the conversion decreased. When the original particle size was increased by 15%, the conversion also decreased. In all cases, the temperature, the total catalyst weight, and all other conditions remained unchanged. What’s going on here?
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Ternary Phase Diagram+ Material balance
Feed mixture weighing 200 kg of unknown composition containing water, acetic acid, isopropyl ether is
contacted in a single stage with 280kg mixture containing 40wt% acetic acid. 10wt% water and 50wt% isopropyl
ether. The resulting raffinate layer weight 320 kg and containing 29.5 wt% acetic acid, 66.5 wt% water and 4wt%
isopropyl ether. Determine the composition of the original feed mixture and the extract layer
Water layer
Isopropyl ether layer
acetic acid
0
water
98.8
Isopropyl ether
1.2
acetic acid
0
water
Isopropyl ether
0.6
99.4
0.69
98.1
1.2
0.18
0.5
99.3
1.41
97.1
1.5
0.37
0.7
98.9
2.89
95.5
1.6
0.79
0.8
98.4
6.42
91.7
1.9
1.93
1
97.1
13.3
84.4
2.3
4.82
1.9
93.3
25.5
71.1
3.4
11.4
3.9
84.7
36.7
58.9
4.4
21.6
6.9
71.5
44.3
5.1
10.6
31.1
10.8
58.5
46.4
37.1
16.5
36.2
15.1
48.7
Graphically+Material balance
2500 kg/hr of (20-80) nicotine water solution is to be extracted with benzene containing 0.5% nicotine in
the 1st and 2nd stages while the 3rd stage is free of nicotine. Cross-current operation is used with different amounts
of solvent for each stages 2000kg/hr in the 1st stage, 2300 kg/hr in the 2nd stage, 2600 kg/hr in the 3rd,
determine:-
a- The final raffinate concentration and % extraction.
b- b-The minimum amount of solvent required for counter-current operation if the minimum concentration
will be reduced to 5% in the outlet raffinate.
Equilibrium data
Wt % Nicotine in water
0
4
16
25
Wt % Nicotine in benzene
0
4
21
30
Chapter 5 Solutions
ELEMENTS OF CHEM. REACTION ENGR
Ch. 5 - If it takes 11 minutes to cook spaghetti in Ann...Ch. 5 - Prob. 5.3PCh. 5 - Prob. 5.4PCh. 5 - The elementary gas-phase reaction 2A B is carried...Ch. 5 - A reversible liquid-phase isomerization is carried...Ch. 5 - Prob. 5.7PCh. 5 - Prob. 5.8PCh. 5 - Prob. 5.9PCh. 5 - Troubleshooting (a) A liquid-phase isomerization A...Ch. 5 - Prob. 5.11P
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