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Purification of natural gas is important to avoid pipe corrosion and improve its specific heat. This operation is mainly focused on hydrogen sulfide and carbon dioxide removal from methane, and adsorption is one of the proposed techniques. In this work, experimental adsorption isotherms for CH4, CO2 or H2S, in NaY zeolite, at 30°C were determined and the Ideal adsorption solution theory (IAST) and Langmuir adsorption isotherm were used to predict the adsorption behavior of the gas mixture composed by CH4 + CO2 + H2S, at 1, 20 or 50 bar. According to Langmuir equation, the maximum adsorbed capacity was approximately 3.77, 7.06, and 7.02 mol/kg, for CH4, CO2, and H2S, respectively. The calculated values of distribution coefficient (K) and selectivity (S) indicate zeolite adsorbs more H2S than CO2. Also, K values are increased with CH4 content, although S values are greater for high H2S concentration.

PREDICTION OF THREE COMPONENT GAS ADSORPTION WITH IAST AND LANGMUIR