No abstract

High-pressure sorption isotherms of CH 4 , C 2 H 6 , and their mixtures on shales from Sichuan Basin, China, were measured by a volumetric method. The sorption measurements for pure components were conducted at 40, 60, and 80 °C, with the pressure up to ∼20 MPa. The binary sorption measurements were performed to ∼11 MPa at 40 °C and ∼16 MPa at 80 °C, and two feed gas compositions of C 2 H 6 (10 and 20%) were studied. The excess sorption isotherms of pure components were fitted by the three-parameter Langmuir model, and the extended Langmuir (EL) model was used to predict the absolute sorption isotherms of binary mixtures. The sorption discrepancies of CH 4 /C 2 H 6 were discussed, and the preferential sorption of C 2 H 6 was quantitatively analyzed. As the temperature decreases, the excess sorption isotherm of C 2 H 6 presents a more sharp increase and then a more rapid decrease. The excess sorption isotherms of C 2 H 6 at 40 °C show significant differences with other CH 4 /C 2 H 6 isotherms. In comparison to gas composition, the temperature has a more notable effect on binary excess sorption isotherms. C 2 H 6 shows a stronger affinity than CH 4 , and its stronger affinity is less significant in the mixtures compared to the single component. The sorption selectivity presents a first increasing and later decreasing trend with the pressure. The presence of C 2 H 6 mainly reduces the excess sorption of CH 4 at a high pressure, and its effect at a low pressure is negligible.

No abstract

No abstract

No abstract