Effect of Cosolvents on Solute Solubility in and Separability Between Liquid Phases in Liquid-liquid vapor Equilibrium Systems

摘要：cts-9730853 k。陆/ U。为了对选定的普通气体溶剂+溶质+助溶剂的三元混合物的液-液-气（llg）平衡进行实验研究，寻求了塔尔萨的支持。这项研究将有助于理解共溶剂是如何增强富气溶剂液相（l2）从富溶质液相（11）中提取溶质的能力的。将对几种三元混合物的lg区域进行详细的研究，以评估共溶剂极性和相浓度在提高气体溶剂丰富的液体l2中各种相对不易挥发的液体溶质的摩尔浓度方面的作用。本文提出了九种气态溶剂+溶质+助溶剂的三元混合物，六种气态溶剂为二氧化碳，三种气态溶剂为乙烷。溶质将从分子结构明显不同的物种（正十四烷、l-甲基苯、l-癸醇）中选择，这些物种迄今为止与这些气体溶剂表现出部分混溶性。将根据其极性选择助溶剂（甲醇或丙酮，这两种物质在原型超临界萃取系统中提高气相溶解度方面引起了以前的兴趣）。研究将在250至325 K的温度范围内进行，压力为90巴（9兆帕），在现有的视觉细胞设备中进行，这些设备是专门为多相平衡现象的研究而设计的。亚临界气体萃取系统在适当的温度和压力下提供致密（即液体）气-溶剂相。从这项研究中得到的数据对于提出在良性条件下从环境、制造和精炼应用中出现的复杂混合物中分离某些分子类型物种的可能新方法具有价值。此外，这些研究将进一步扩大我们对多相平衡现象的理解，增加有限的现有实验数据库。

ABSTRACT CTS-9730853 K. Luks/U. of Tulsa Support is sought for the experimental study of liquid-liquid-vapor (llg) equilibria of selected ternary mixtures of common gas solvents + solutes + cosolvents. This research will contribute to the understanding of how cosolvents may enhance the capacity of the gas-solvent-rich liquid phase (l2) for extracting solutes from a solute-rich liquid phase (11) in an llg subcritical system. Detailed studies of the llg regions of several ternary mixtures will be carried out to evaluate the roles that cosolvent polarity and phase concentration may have in enhancing the molar concentration of a variety of relatively non-volatile liquid solutes in the gas-solvents-rich liquid l2. It is proposed that the llg phase equilibria be studies for nine ternary mixtures composed of gas solvent + solute + cosolvent, six containing the gas solvent carbon dioxide and three containing the gas solvent ethane. The solute will be selected from species of distinctly different molecular structure (n-tetradecane, l-methylbenzene, l- decanol), species that have heretofore exhibited llg partial miscibility with these gas solvents. The cosolvent will be selected according to it polarity (methanol or acetone, species that has attracted previous interest with respect to enhancing gas-phase solubility in prototype supercritical extraction systems). The studies will be performed in the temperature range of 250 to 325 K at pressure to 90 bars (9 Mpa) in existing visual cell apparatuses especially designed for and dedicated to the study of multiphase equilibria phenomena. Subcritical llg extraction systems offer a dense (i.e., liquid) gas-solvent phase at modest temperatures and pressures. The data resulting from this study will be of value for suggesting possible new ways to separate at benign conditions certain molecular types of species from complex mixtures that occur in environmental, manufacturing, and refining applications. Additionally, these studies will further expand our understanding of multiphase equilibrium phenomena in general by adding to the limited existing experimental database of llg systems.