(Solution) - In Examples 15 11 and 15 13 benzene is adsorbed from air -(2025 Original AI-Free Solution)

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In Examples 15.11 and 15.13, benzene is adsorbed from air at 70°F in a 6-ft-high bed of silica gel and then stripped with air at 145°F. If the bed height is changed to 30 ft, the following data are obtained for breakthrough at 641 minutes for the adsorption step:

If the bed is regenerated isothermally with pure air at 1 atm and 145oF, and the desorption of benzene during the heatup period is neglected, determine the loading, q, profile at a time sufficient to remove 90% of the benzene from the bed if an interstitial pure air velocity of 98.5 ft/min is used. Values of k and K at 145°F are given in Example 15.13.