Estimating the overall mass transfer coefficient k(v) of the Wheeler-Jonas equation: a new and simple model.

The modified Wheeler-Jonas model is well known for its good prediction of breakthrough times for organic vapors on activated carbon beds. To use this model adequately one must estimate the overall adsorption rate coefficient kv. In this work a new equation is proposed to calculate kv. The relevant parameters of this equation are the airstream velocity, the affinity constant beta of the organic vapor, and the mean diameter of the carbon particles. Very accurate predictions were obtained for breakthrough times on a wide range of carbons using the calculated values of kv. Compared with other models, this model shows a higher accuracy and a lower degree of uncertainty.