Adsorption Characteristics of CO2/CH4/N2 Ternary Mixtures on Anthracite from 293.15 to 353.15 K and Pressures Up to 7 MPa.

Abstract

We present the adsorption data of CO2, CH4, and N2 ternary mixtures on anthracite from 293.15 to 353.15 K and pressures up to 7 MPa obtained via a volumetric method. The experimental data are given at different conditions, and simple analysis is made. The results show that the excess adsorption capacity of the CO2/CH4/N2 mixture and its component gases decreases linearly with the increase of temperature for constant composition. The total adsorption capacity is between pure CO2 and pure N2 in the entire pressure range. The effect of total pressure on total adsorption capacity is mainly influenced by the CO2 mole fraction in the feed gas. However, the adsorption capacities of CH4 and N2 decrease, and CO2 presents a maximum with the decrease in total pressure. For the feed gases of 10% CH4 and 16% CO2, the total adsorption capacity increases when the ratio of CO2 and CH4 increases, respectively, and the increasing magnitudes for 10% CH4 are larger than that of 16% CO2. The obtained experimental data are in agreement with the extended three-parameter Ono–Kondo model.