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6.106. Air at 25°C and 1 atm with a relative humidity of 25% is to be dehumidified in an adsorption column 19 packed with silica gel. The equilibrium adsorptivity of water on silica gel is given by the expression" X*(kg water/100 kg silica gel) = 12.5 P;0 where PH,0 is the partial pressure of water in the gas contacting the silica gel and po is the vapor pressure of water at the system temperature. Air is fed to the column at a rate of 1.50 L/min until the silica gel is saturated (i.e., until it reaches equilibrium with the feed air), at which point the flow is stopped and the silica gel regenerated. (a) Calculate the minimum amount of silica gel needed in the column if regeneration is to take place no more frequently than every two hours. State any assumptions you make. (b) Briefly describe this process in terms that a high school student would have no trouble under- standing. (What is the process designed to do, what happens within the column, and why is regeneration of the column packing necessary?)

6.106. Air at 25°C and 1 atm with a relative humidity of 25% is to be dehumidified in an adsorption column 19 packed with silica gel. The equilibrium adsorptivity of water on silica gel is given by the expression" X*(kg water/100 kg silica gel) = 12.5 P;0 where PH,0 is the partial pressure of water in the gas contacting the silica gel and po is the vapor pressure of water at the system temperature. Air is fed to the column at a rate of 1.50 L/min until the silica gel is saturated (i.e., until it reaches equilibrium with the feed air), at which point the flow is stopped and the silica gel regenerated. (a) Calculate the minimum amount of silica gel needed in the column if regeneration is to take place no more frequently than every two hours. State any assumptions you make. (b) Briefly describe this process in terms that a high school student would have no trouble under- standing. (What is the process designed to do, what happens within the column, and why is regeneration of the column packing necessary?)

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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6.106. Air at 25°C and 1 atm with a relative humidity of 25% is to be dehumidified in an adsorption column 19 packed with silica gel. The equilibrium adsorptivity of water on silica gel is given by the expression" X*(kg water/100 kg silica gel) = 12.5 P;0 where PH,0 is the partial pressure of water in the gas contacting the silica gel and po is the vapor pressure of water at the system temperature. Air is fed to the column at a rate of 1.50 L/min until the silica gel is saturated (i.e., until it reaches equilibrium with the feed air), at which point the flow is stopped and the silica gel regenerated. (a) Calculate the minimum amount of silica gel needed in the column if regeneration is to take place no more frequently than every two hours. State any assumptions you make. (b) Briefly describe this process in terms that a high school student would have no trouble under- standing. (What is the process designed to do, what happens within the column, and why is regeneration of the column packing necessary?)
Transcribed Image Text:6.106. Air at 25°C and 1 atm with a relative humidity of 25% is to be dehumidified in an adsorption column 19 packed with silica gel. The equilibrium adsorptivity of water on silica gel is given by the expression" X*(kg water/100 kg silica gel) = 12.5 P;0 where PH,0 is the partial pressure of water in the gas contacting the silica gel and po is the vapor pressure of water at the system temperature. Air is fed to the column at a rate of 1.50 L/min until the silica gel is saturated (i.e., until it reaches equilibrium with the feed air), at which point the flow is stopped and the silica gel regenerated. (a) Calculate the minimum amount of silica gel needed in the column if regeneration is to take place no more frequently than every two hours. State any assumptions you make. (b) Briefly describe this process in terms that a high school student would have no trouble under- standing. (What is the process designed to do, what happens within the column, and why is regeneration of the column packing necessary?)
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