Experimental determination of the adsorption isotherms in gas mixtures under extended pressure and temperature range: Application to the CO 2-CH4 binary mixture
Résumé
An experimental tool was adapted and developed to measure adsorption in gas mixture under broad range of pressure and temperature. The approach of this "homemade" apparatus consists in coupling a manometric device with a gas chromatograph. The core of the paper is thus devoted to a detailed description of both the experimental apparatus and methodology applied for the measurements. The adsorption of pure carbon dioxide and methane and their equimolar mixture were studied in a microporous activated carbon. Experimental isotherms are provided up to 3 MPa for three temperatures at 303.15, 323.15, and 353.15 K. As expected, the binary adsorption isotherms mixture reveals a preferential adsorption of CO2 compared to CH4 over the whole pressure and temperature range. A separation factor of about 2.5 was observed. This separation factor decreases with increasing pressure. Finally, the consistency between the pure compound and the binary mixture data was checked by the use of the IAST theory. © 2014 Akadémiai Kiadó, Budapest, Hungary.