The influence of humidity on the overall mass transfer coefficient of the Wheeler-Jonas equation.
The Wheeler-Jonas model is well known for its good prediction of breakthrough times for organic vapors on activated carbon beds. However, it is valid only in dry conditions: no prewetting of the filter and no humidity in the ambient air during use. One of the parameters that is likely to be influenced is the overall mass transfer coefficient kv. By measuring over 200 breakthrough times, with 7 different vapors on 4 different types of activated carbon, a simple but satisfactory model for the influence of moisture on kv was established. The only items of information needed, compared with the application of the Wheeler-Jonas equation under dry circumstances, are the water isotherm and the total pore volume of the activated carbon.
Lodewyckx
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Belgian Army--DTT/NBC-Division, B-1800 Vilvoorde Peutie. Peter.Lodewyckx@pi.be
Vansant
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D000327:Adsorption; D002244:Carbon / Q000737:chemistry; D005374:Filtration / Q000379:methods; D005740:Gases / Q000737:chemistry*; D006801:Humans; D006813:Humidity; D008422:Materials Testing / Q000706:statistics & numerical data*; D008962:Models, Theoretical; D009930:Organic Chemicals / Q000737:chemistry*; D012134:Respiratory Protective Devices
D005740:Gases; D009930:Organic Chemicals; D002244:Carbon