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Problem 5. A gas stream containing 8 mol % species A is sent to an absorption column (operated at 10 atm) that uses water as absorbent. Assuming that the water flow rate is 120 times the gas stream flow rate, constant molar overflow (CMO), and linear equilibrium line in the composition range of interest, use the graphical method to determine the number of theoretical stages needed to remove 90% of the A in the gas stream. Note that the saturation vapor pressure for species A is 880 atm. The activity coefficient of species A in the liquid phase is assumed to be 1.

Problem 5. A gas stream containing 8 mol % species A is sent to an absorption column (operated at 10 atm) that uses water as absorbent. Assuming that the water flow rate is 120 times the gas stream flow rate, constant molar overflow (CMO), and linear equilibrium line in the composition range of interest, use the graphical method to determine the number of theoretical stages needed to remove 90% of the A in the gas stream. Note that the saturation vapor pressure for species A is 880 atm. The activity coefficient of species A in the liquid phase is assumed to be 1.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Problem 5. A gas stream containing 8 mol% species A is sent to an absorption column (operated at 10 atm) that uses water as absorbent. Assuming that the water flow rate is 120 times the gas stream flow rate, constant molar overflow (CMO), and linear equilibrium line in the composition range of interest, use the graphical method to determine the number of theoretical stages needed to remove 90% of the A in the gas stream. Note that the saturation vapor pressure for species A is 880 atm. The activity coefficient of species A in the liquid phase is assumed to be 1. Hint: it is easier to draw the equilibrium line and operating line in Excel to ensure accuracy. Also, we are not interested in the entire composition space (in which the linear VLE assumption will no longer be valid), so it is important to draw the McCabe-Thiele plot only in the composition region of interest to ensure higher accuracy of the graphical method.
Transcribed Image Text:Problem 5. A gas stream containing 8 mol% species A is sent to an absorption column (operated at 10 atm) that uses water as absorbent. Assuming that the water flow rate is 120 times the gas stream flow rate, constant molar overflow (CMO), and linear equilibrium line in the composition range of interest, use the graphical method to determine the number of theoretical stages needed to remove 90% of the A in the gas stream. Note that the saturation vapor pressure for species A is 880 atm. The activity coefficient of species A in the liquid phase is assumed to be 1. Hint: it is easier to draw the equilibrium line and operating line in Excel to ensure accuracy. Also, we are not interested in the entire composition space (in which the linear VLE assumption will no longer be valid), so it is important to draw the McCabe-Thiele plot only in the composition region of interest to ensure higher accuracy of the graphical method.
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