EXPERIMENTAL EVALUATION OF ACTIVATED CARBON PERFORMANCE FOR CO2 AND CH4 ADSORPTION WITH ISOTHERM MODEL ADJUSTMENT

EXPERIMENTAL EVALUATION OF ACTIVATED CARBON PERFORMANCE FOR CO2 AND CH4 ADSORPTION WITH ISOTHERM MODEL ADJUSTMENT

• Autor
• Ana Luisa Nogueira dos Santos
• Co-autores
• Deborah Carneiro da Silva , Fábio Pedro do Nascimento , Ladislane dos Santos Bastos , Silvio Alexandre Beisl Vieira de Melo
• Resumo

• CO2 capture and separation technologies are under debate for their importance in mitigating the environmental effects of carbon dioxide emission. An important issue is the separation of CO2 from pre-salt gas streams, mainly methane. Since Brazilian legislation requires CO2 concentration in the natural gas stream lower than 3% mol, adsorbent technology is a promising alternative. This work preliminary evaluated the performance of activated carbon to separate CO2/CH4 by using CO2, CH4, and CO2/CH4 equimolar binary mixture adsorption equilibrium isotherm data. The experiments were carried out in a gravimetric sorption analyzer with a magnetic suspension balance at 34°C in a pressure range from 0 to 45 bar. Isotherm models (Langmuir and SIPS) were adjusted to the pure components experimental data as well as Extended Langmuir, IAST Langmuir, and IAST SIPS models predicted the binary mixture behavior. The experimental data fitted the type I isotherm, which is compatible with activated carbon, a microporous structured material, and associated with adsorption in micropores and homogeneous surfaces. The SIPS model provided the best fit for pure component adsorption while IAST Langmuir was the best choice to predict the binary mixture behavior. The results improved understanding of the adsorption process using activated carbon and clarified the adsorption phenomena for CO2 capture from the pre-salt associate gas scenarios. 

• Palavras-chave
• Adsorption, Carbon dioxide, Methane, Activated carbon, Equilibrium isotherm models
• Área Temática
• Modelagem e Simulação