Influence of water vapor condensation inside nano-porous 4A adsorbent in adsorption-desorption cyclic process of natural gas dehydration

Consequences of water vapor condensation were studied in natural gas dehydration using 4A zeolite. Adsorption-desorption isotherms were studied experimentally and isotherm parameters were predicted using two-site Sips model with maximum 9.6% deviation. Water vapor diffusivity within the adsorbent pores was evaluated and modified by predicting the pore filling pattern. The dehumidification process was modeled employing two assumptions, in the first case, water vapor was assumed to condense within the particles and in the second case no condensation was taken place. After comparison, it was resulted that in the first case, 12% less vapor was absorbed in the bed and 14% more vapor remained inside the adsorbent pores after regeneration.