Comparative simulation study of PSA,VSA, and TSA processes for purification of methane from CO2 via SAPO-34 core-shell adsorbent

Cyclic adsorption processes of PSA, VSA, and TSA were modeled and numerically simulated using SAPO-34 core-shell adsorbent. The results were compared with ordinary SAPO-34 to achieve a more efficient process for CO₂–CH₄ separation. OCM coupled with method of lines was used for numerical solution of the mechanistic model. The simulation results revealed higher efficiency of core-shell adsorbent with less usage of SAPO rather than the ordinary adsorbent to achieve the same degree of purification and recovery. VSA and TSA processes against PSA resulted in CH₄ purification capability more than 99% with more than 73% recovery. However, VSA process has revealed higher productivity rather than TSA.