Thermodynamic Characteristics of Adsorption of Saturated Hydrocarbons (C1–C4) and CO2 by Divinylbenzene and 4-Vinylbenzyl Chloride Copolymer
摘要
The sorption of the light saturated hydrocarbons (C1–C4) and CO2 on a divinylbenzene and 4-vinylbenzyl chloride copolymer was studied using inverse gas chromatography in the temperature range 323.15–383.15 K. The values of the specific retention volume (Vg), as well as the enthalpy of adsorption change (– ∆HCH4 = 20.74 kJ mol−1; – ∆HCO2 = 24.53 kJ mol−1; – ∆HC2H6 = 27.40 kJ mol−1; – ∆HC3H8 = 33.78 kJ mol−1; – ∆HC4H10(i) = 37.04 kJ mol−1; – ∆HC4H10(n) = 39.27 kJ mol−1), entropy of adsorption change (– ∆SCH4 = 77.16 J mol−1 K−1; – ∆SCO2 = 73.12 J mol−1 K−1; – ∆SC2H6 = 77.45 J mol−1 K−1; – ∆SC3H8 = 85.34 J mol−1 K−1; – ∆SC4H10(i) = 88.71 J mol−1 K−1; – ∆SC4H10(n) = 91.77 J mol−1 K−1) and Gibbs free energy of adsorption change (∆G) of the above gases adsorption were determined. The obtained thermodynamic parameters demonstrate the potential for efficiently separating the gases under study, indicating the copolymer’s ability to separate the main components of natural gas.