Assignment:
If the adsorption process described in Problem 3.16 took place cocurrently, calculate the minimum flow rate of activated carbon required
Q1. Activated carbon is used to recover benzene from a nitrogen-benzene vapor mixture. A nitrogen-benzene mixture at 306 K and 1 atm containing 1 % benzene by volume is to be passed countercurrently at the rate of 1 .O m3/s to a moving stream of activated carbon so as to remove 85% of the benzene from the gas in a continuous process. The entering activated carbon contains 15 cm3 benzene vapor (at STP) adsorbed per gram of the carbon. The temperature and total pressure are maintained at 306 K and 1 atm. Nitrogen is not adsorbed.
(a) Plot the equilibrium data given below as X'= kg benzene/kg dry carbon, Y'= kg benzene/kg nitrogen for a total pressure of 1 atm.
(b) Calculate the minimum flow rate required of the entering activated carbon (remember that the entering carbon contains some adsorbed benzene).
(c) If the carbon flow rate is 20% above the minimum, what will be the concentration of benzene adsorbed on the carbon leaving?
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Benzene vapor adsorbed,
cm3 (STP)/g carbon
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Partial pressure benzene,
mmHg
|
|
15
|
0.55
|
|
25
|
0.95
|
|
40
|
1.63
|
|
50
|
2.18
|
|
65
|
3.26
|
|
80
|
4.88
|
|
90
|
6.22
|
|
100
|
7.83
|
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