Air at 25°C and 1 atm with a relative humidity of 25% is to be dehumidi?ed in an adsorption column packed with silica gel. The equilibrium absorptivity of water on silica gel is given by the expression19
where
(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) Brie?y 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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