Abstract
For adsorption processes involving concave equilibrium isotherms and finite desorption periods, the choice of cycle time has a decisive influence on separation efficiency. Using forward-flow desorption, efficiency goes through a maximum at an optimum cycle time; with reverse-flow desorption efficien increases with decreasing cycle time. Below, this behavior is explained in terms of a simple graphical solution for the case of a moving-bed countercur column, and by comparison with a continuous-flow permeation process. An experimental study has been made with the system n-heptane/hydrogen/zeolite at 300°C in a computer-controlled benchscale column. Reverse-flow desorption is shown to permit a considerable reduction in the desorption gas volume required to meet efficiency demands.
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