Adsorption of moisture on molecular sieve adsorbents at low humidity

This report summarizes the results and conclusions of a contractor's study on the performance of 4A molecular sieve under very low humidity conditions, e.g., as expected in fusion reactor plants. The results suggest that: (a) very efficient regeneration of the sieve to low residual moisture contents (<approximately 2 g/100 g sieve) is necessary to ensure adequate performance with exit dew points of -60 degrees C or less; (b) based on equilibrium data, there is no significant isotopic effect at water vapor concentrations above about 100 μL/L i.e., molecular sieve driers for this condition can be designed for the adsorption of DTO/HTO using easily obtainable data for the H2O/4A sieve system