Constanza Cumicheo;Marcela Cartes;Hugo Segura;Erich A. Müller;Andrés Mejía
来源期刊：Fluid Phase Equilibria
Experimental isothermal densities and interfacial tensions for the binary systems carbon dioxide + n-dodecane, carbon dioxide + n-tridecane and carbon dioxide + n-tetradecane at 344.15 K and over thepressure range 0.1 to 12, 13 and 14 MPa, are reported. Measurements are carried out on a combined devicethat includes a high-pressure vibrating tube densimeter and a high-pressure pendant drop tensiome-ter. The theoretical modeling is based on the use of square gradient theory as applied to the statisticalassociated fluid theory (SAFT) equation of state. The experimental bulk phase equilibrium densities andinterfacial tensions obtained are in very good agreement with the theoretical modeling. By seamlesslycombining experimental and modeling approaches we are able to simultaneously predict phase equi-librium and interfacial properties. For the systems and conditions studied we do not observe mass normolar barotropic inversion; the interfacial tensions decrease as the pressure (or liquid mole fractionof carbon dioxide) and/or as the n-alkane molecular chain length increases. The surface relative Gibbsadsorption of the species along the interfacial region is reported; carbon dioxide is adsorbed along theinterfacial region, whereas n-alkanes (n-dodecane, or n-tridecane or n-tetradecane) do not exhibit anyspecial adsorption activity. The adsorption of carbon dioxide increases with pressure and with the chainlength of the n-alkane.
来源期刊：Journal of Chemical and Engineering Data: the ACS Journal for Data
年/卷/期：2020 / 65 / 8
It has been proven that alcohols can regulate the performance of aviation fuels. In this work, the densities (rho) and viscosities (eta) for the ternary system of isopropylcyclohexane (1) + n-tridecane (2) + n-butanol (3) and the corresponding binary systems have been measured to understand the physical properties of endothermic hydrocarbon fuel with alcohol over the whole composition range at temperatures from 293.15 to 333.15 K under atmospheric pressure (p = 0.1 MPa). The Redlich-Kister equation has been used to fit the excess molar volumes ((E)(Vm)) and viscosity deviations (Delta(eta)) of binary systems, while four semiempirical equations (Singh, Cibulka, Nagata-Tamura, and Redlich-Kister) have been applied to correlate (E)(Vm) and Delta(eta )of the ternary system. For all binary systems, the values of (E)(Vm) are positive. The values of Delta(eta) for binary systems containing n-butanol are all negative. For the ternary system, the values of (E)(Vm) are all positive and the values of Delta(eta) are all negative over the entire concentration range. All results have been interpreted with the perspective of intermolecular interaction and structural effect.
建立野地瓜果实中香气成分的SPME-GC-MS检测方法。同时,优化固相微萃取的条件:萃取温度50℃,萃取时间40 min,萃取时加入8 g Na Cl电解质。冰冻后野地瓜果实中共检测出152种挥发性物质,占总检出物质的99.03%。主要为酯类,占33.06%;醇类,占13.14%;烷烃类,占13.38%;还有酮类,醛类,酸类等物质。含量较高的10种香气成分依次为愈创木酚(14.71%),环丁烷羧酸十二烷基酯(13.54%),正十三烷(6.05%),2-十三烷酮(4.72%),环己硅氧烷(4.44%),环丁烷羧酸癸酯(4.18%),甲基壬基甲酮(3.62%),乙酸(2.98%),环戊烷羧酸十三酯(2.48%),2-十四烷醇(2.31%),等。