期刊
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
卷 30, 期 4, 页码 939-951出版社
BRAZILIAN SOC CHEMICAL ENG
DOI: 10.1590/S0104-66322013000400024
关键词
Adsorption; Selectivity; Carbon dioxide; Methane; Activated carbon
资金
- CNPq
- FINEP
- PRH-ANP (Agencia Nacional do Petroleo, Gas Natural e Biocombustiveis)
- PETROBRAS
Separation of CO2 from CO2-CH4 mixtures is an important issue in natural gas and biogas purification. The design of such separation processes depends on the knowledge of the behavior of multicomponent adsorption, particularly that of CO2-CH4 mixtures. In this study, we present a series of experimental binary equilibrium isotherms for CO2-CH4 mixtures on an activated carbon at 293 K and compare them with predicted values using the Ideal Adsorption Solution Theory (IAST) and the Extended Langmuir (EL) model. Even at concentrations of ca. 20% for all binary isotherms, CO2 already presents higher adsorbed amounts with respect to CH4. A maximum selectivity of around 8.7 was observed for a nearly equimolar mixture at 0.1 MPa. The IAST in conjunction with the Toth equation showed slightly better results than IAST using the Langmuir equation and both showed better results than the EL model.
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