Evaluating the adsorption process

We can use the equilibrium isotherm to predict performance under equilibrium-limited operating conditions [10]. A mass balance on the solute in the MTZ leads to an equation for the velocity of the fi ont  

In desorption, the result is very different. Now, the direction is from the upper right to the lower left portion of the curve. The slope Aq/AY has the smallest value (F is fastest) during the initial portion and V becomes slower as desorption continues. This causes the desorption wave to spread and an elongated breakthrough curve results. 

Some additional system parameters can also be estimated (Equations (7.12) to (7.16)). The minimum weight of sorbent needed to treat a given total weight of fluid is AY/Aq, 

For desorption, first recognize that Aq/AY = H (Henry s Law constant) as the origin of the isotherm is approached. So, the minimum amount of purge fluid needed per weight of column sorbent equals H. The minimum time for breakthrough can then also be determined  

---