Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 59, Issue 30, Pages 13724-13734Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.0c01911
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Funding
- Project VALORCOMP through INTERREG V A Spain Portugal (POCTEP) 2014-2020, under the European Regional Development Fund by FCT [0119_VALORCOMP_2_P]
- Associate Laboratory LSRE-LCM - ERDF through COMPETE2020, Programa Operacional Competitividade e Internacionalizacao (POCI) [POCI-01-0145-FEDER006984]
- FCT.Fundacao para a Ciencia e a Tecnologia
- Foundation for Science and Technology (FCT, Portugal)
- ERDF under Programme PT2020 [UID/AGR/00690/2019]
- FCT, Foundation for Science and Technology [SFRH/BD/148525/2019, SFRH/BD/140550/2018]
- Foundation for Science and Technology (FCT, Portugal) by national funds FCT/MCTES [UIDB/00690/2020]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/140550/2018, SFRH/BD/148525/2019] Funding Source: FCT
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Single- and multicomponent adsorption fixed bed breakthrough experiments of carbon dioxide (CO2), methane (CH4), and nitrogen (N-2) on commercial binder-free beads of 4A zeolite have been studied at 313, 373, and 423 K and a total pressure of up to 5 bar. The ternary experiments (CO2/CH4/N-2) show a practically complete separation of CO2 from CH4/N-2 at all the temperatures studied, with selectivity at 313 K of CO2 around 24 over CH4 and 50 over N-2. The adsorption equilibrium data measured from the breakthrough experiments were modeled by the dual-site Langmuir isotherm, and the breakthrough results were simulated with a fixed bed adsorption model taking into account axial dispersion, mass-transfer resistances, and heat effects. The mathematical model predicts with a good accuracy the systematic behavior of the single- and multicomponent breakthrough results based on the independent parameters calculated from well-established correlations and intracrystalline diffusivities for zeolite 4A available in the literature. The results showed in the present work evidence that the binder-free beads of zeolite 4A can be employed to efficiently separate CO2 from CO2/CH4/N-2 mixtures by fixed bed adsorption.
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