CO2在醚酯溶剂中的溶解度测定及热力学计算

采用恒定容积法，在温度353.15、363.15、373.15 K下，测定了CO₂在丙二醇甲醚醋酸酯(PMA)、二丙二醇甲醚醋酸酯(DPMA)、乙二醇丁醚醋酸酯(BAC)以及乙二醇苯醚醋酸酯(EPA)中的溶解度数据，压力最高可达11.73 MPa。结果表明CO₂在醚酯体系中溶解度受温度、压强的影响较大，压强一定时，CO₂在醚酯中溶解度随温度升高而减小；温度一定时，随着压强增大而增大；相同条件下，CO₂在四种醚酯中溶解度大小为PMA＜ EPA＜BAC＜DPMA。通过变形Clausius - Clapeyron方程，计算得到CO₂在醚酯溶剂中的Gibbs自由能Δ_sol G，溶解焓变Δ_sol H和熵变 Δ_sol S等热力学性质，从宏观热运动角度进一步解释了CO₂的溶解机理，为开发新型CO₂物理吸收剂提供理论支撑。

Solubility determination and thermodynamic calculation of CO2in several ether esters

In this study, the solubility of CO₂ in propylene glycol monomethyl ether acetate (PMA), di(propylene glycol) methyl ether acetate (DPMA), 2-butoxyethyl acetate (BAC) and acetic acid 2-phenoxyethyl ester (EPA) was measured at the temperature variations from 353.15 K to 373.15 K rang up to 11.73 MPa by the constant-volume method. Results showed that the solubility of CO₂ in the ether esters solvents decreased with the increasing of temperature, increased with the increasing of pressure, and the solubility was PMAsol G, enthalpy change Δ_sol H and entropy change Δ_sol S of CO₂ + ether ester system at different temperatures were also calculated by transformed Clausius-Clapeyron equation, further explained the dissolution mechanism of CO₂ from the perspective of macroscopic thermal motion, and provided theoretical support for the development of new CO₂ physical absorbents.