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Is there a relation between feed flow rate and bed height for adsorption towers in TSA systems?

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The bed height depends on the adsorption capacities of the various components. The bed must be able to contain the water inside i.e. no breakthrough of water, but not long enough to trap all of the other gas components. You should also remember that higher the flow rate, you will also have a high pressure drop and that is also taken into consideration while determining bed height.