Influence of humidity on adsorption capacity from the Wheeler-Jonas model for prediction of breakthrough times of water immiscible organic vapors on activated carbon beds

The Wheeler-Jonas model is well known for its good prediction of breakthrou gh times for organic vapors on activated carbon beds. However, in its origi nal form it is only valid under dry conditions: no prewetting of the filter and no humidity in the ambient air during use. The main parameter in the W heeler-Jonas equation is the adsorption capacity, W-e. By measuring over 20 0 breakthrough times, with 7 different vapors on 3 different types of activ ated carbon, a satisfactory model for the influence of moisture on W-e was established. The only supplementary information needed, compared with the a pplication of the Wheeler-Jonas equation under dry circumstances, is the wa ter isotherm of the activated carbon.