Abstract
In natural gas sweetening processes, expensive technologies are usually applied, where adsorption can be a viable and economic alternative. In this sense, the usage of adsorption for natural gas sweetening depends on adsorbent potentiality. Thus, in this work, the potential usage of FAU NaX and NaY for natural gas sweetening at high-pressure (4 MPa) and ambient temperature (298 K) by adsorption processes was investigated by simulations using a validated Multicomponent Potential Theory of Adsorption coupled to Dubinin–Radushkevitch–Astakhov model (MPTA-DRA). Pure component adsorption data for H2S, CO2, CH4 and N2 show favorable isotherms on both materials and the correlation using MPTA-DRA model is in good agreement with experimental results. The simulation of multicomponent sour natural gas adsorption indicates that almost none CH4 and N2 are adsorbed in conditions studied and that CO2 and H2S compete for adsorption sites on both NaX and NaY. Partition coefficients of H2S are higher than CO2 and increase from 18.90 to 43.30, for NaX, and from 4.04 to 27.39, for NaY, as CO2 molar fraction in bulk phase decreases. The selectivity of H2S over CO2 follows a different trend, decreasing from 27.16 to 20.14 for NaX and remaining somewhat constant around 4 for NaY. These results suggest higher selectivity for NaX when a lower CO2 molar gas fraction is present. Meanwhile, for NaY, the CO2 molar fraction does not influence the H2S/CO2 selectivity. Therefore, simulations indicate that FAU NaX and NaY have good potential for natural gas sweetening at 4 MPa and 298 K.
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Pereira, M.V., de Oliveira, L.H., do Nascimento, J.F. et al. Simulation of high-pressure sour natural gas adsorption equilibrium on NaX and NaY zeolites using the multicomponent potential theory of adsorption. Adsorption 29, 65–72 (2023). https://doi.org/10.1007/s10450-022-00373-9
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DOI: https://doi.org/10.1007/s10450-022-00373-9