Bulk Separation and Purification of CH4/CO2Mixtures on 4A/13X Molecular Sieves by Using Pressure Swing Adsorption

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Abstract
Results of bulk gas separation and purification of a CH4/CO2 mixture by pressure swing adsorption (PSA) are reported. Bulk gas separation and purification of CH4/CO2 mixture have direct application in landfill gases and tertiary oil recovery and effluent separations. ZMS-13X/4A with calculated kinetic selectivities equal to 0.604 and 0.601, respectively, were used as sorbents. The step times corresponding to various flow rates and compositions were chosen to allow sorption of CO2 but preclude penetration of CH4 into the micropores. By using a simulated biogas mixture (66% CH4 and 34% CO2) as a feed, the results for bulk gas separation for a PSA cycle between 1.2–36.0 PH/PL ratios over ZMS-13X adsorbent was 95% or more CH4 in the raffinate, whereas with a 10/90 CH4/CO2 feed, purification over ZMS-4A at PH/PL ratios of 10–304 gave 85–90% CH4 at 900 and 1800 mL/min flow rates.

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