CO2在醚酯溶剂中的溶解度测定及热力学计算  

Solubility determination and thermodynamic calculation of CO2 in several ether esters

作　　者：徐学满 桂霞[1] 云志[1] XU Xueman;GUI Xia;YUN Zhi(College of Chemical Engineering,Nanjing Tech University,Nanjing 211816,Jiangsu,China)

机构地区：[1]南京工业大学化工学院

出　　处：《化工学报》2019年第11期4113-4122,共10页CIESC Journal

基　　金：国家自然科学基金面上项目(NSFC 21676145);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：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ΔsolG,溶解焓变ΔsolH和熵变ΔsolS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。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 PMAEPABACDPMA,which was greatly affected by temperature and pressure.Meanwhile,thermodynamic properties of the Gibbs free energyΔsolG,enthalpy changeΔsolH and entropy changeΔsolS 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.

关 键 词：溶解度 恒定体积法 CO2 醚酯溶剂 热力学性质 

分 类 号：O642.42[理学—物理化学]