Understanding Interfacial Mass Transport Phenomena in Biphasic Ionic Liquid Systems with Organic Solvents and Compressed CO2

提案编号：CBET- 0731244主要研究者：Aaron M. Scurto大学/机构：堪萨斯大学研究中心题目：了解两相离子液体系统中有机溶剂和压缩CO2的界面传质现象 离子液体（IL）由于其缺乏蒸气压和分子“可调”性质而被吹捧为下一类环境友好溶剂。新型离子液体和新的应用正在快速发展，用于萃取，反应和材料加工。将离子液体与有机溶剂，特别是与压缩CO2偶联的系统对于工艺开发具有许多优点。压缩CO2可缓解许多挑战（例如粘度、溶解度等）。使用离子液体。然而，几乎没有界面传质数据，也没有强调任何这些两相系统的过程强化。如果不了解传质系数和相关现象，就不可能广泛使用。因此，本研究将尝试建立一个基本的方法学过程开发使用几个模型离子液体，溶剂和溶质。先进的理论和建模技术将被采用，以允许任何特定的或未来的离子液体的快速实施。智力优点：离子液体正在寻找各种各样的萃取，反应和材料加工应用的许多潜在用途。由于常用的分离技术，如蒸馏，对于某些分离是不可行的，因此人们对最常用的两相流体方案越来越感兴趣。然而，界面传质必须是已知的工艺优化。即使对于最常见的离子液体和其他溶剂和溶质，也几乎没有实验数据。这一建议将代表第一个系统的实验和理论研究的传质系数，粘度，扩散系数，和表面张力ofsolutions在两相离子液体系统。偶联CO2克服了离子液体的许多挑战：高粘度/低扩散率;反应气体/底物的低溶解度;难以分离与离子液体的混合物;并且大多数离子盐是固体而不是液体。然而，目前还没有关于两相离子液体/CO2体系界面传质的研究。这一建议将独特的调查有关的传质离子液体的有益性能。传质数据将使用先进的成像和处理ofpendant和流动液滴与详细的流体动力学model.Broader影响：离子液体传质性能的基本原理的透彻理解将允许过程强化和工业应用，这可能会导致减少暴露于社会和环境。此外，具有实现高效率水平的离子液体的新工艺也将向公众提供。压缩CO2或在某些情况下明智地选择常规溶剂，也可能导致实现离子液体的潜在环境优势。该项目将向学生介绍必要的实验和理论建模技能，以正确设计环境友好的替代品，并将其与传统技术进行批判性比较。此外，整个过程将导致纳入优秀的案例研究，在当前的课程在堪萨斯大学：环境友好的反应工程和化学加工的环境评估。展品将在KU的当地活动中展示，例如为本科生和高中生举办的“化学嘉年华”和工程“博览会”。目前，公共信息学院已经招募了一名非洲女学生参与这一项目，以促进教育的多样性。

Proposal Number: CBET- 0731244 Principal Investigator: Aaron M. ScurtoUniversity/Institution: University of Kansas Center for ResearchTitle: Understanding Interfacial Mass Transport Phenomena in Biphasic Ionic Liquid Systems with Organic Solvents and Compressed CO2 Ionic liquids (ILs) have been touted as the next great class of environmentally-friendly solvents due to their lack of vapor-pressure and molecularly "tunable" properties. New types of ionic liquids and new applications are being developed at a rapid pace for extractions, reactions,and materials processing. Systems that couple ILs with organic solvents and especially with compressed CO2, have a number of advantages for process development. Compressed CO2 ameliorates many of the challenges (e.g. viscosity, solubility, etc.) using ionic liquids. However, there exists little to no interfacial mass transfer data and no emphasis on process intensificationfor any of these biphasic systems. Without an understanding of the mass transfer coefficients and related phenomena, widespread use cannot occur. Therefore, this research will attempt to establish a foundational methodology for process development using several model ionic liquids,solvents, and solutes. Advance theoretical and modeling techniques will be employed to allow rapid implementation of any specific or future ionic liquid.Intellectual Merit:Ionic liquids are finding numerous potential uses for a wide variety of extractions, reactions, and material processing applications. As common separation techniques, such as distillation, are not feasible for some separation, there is increasing interest in biphasic fluid scenarios are mostcommonly employed. However, interfacial mass transfer must be known for process optimization. Little to no experimental data exists even for the most common ionic liquids and other solvents and solutes. This proposal will represent the first systematic experimental and theoretical study of the mass transfer coefficients, viscosity, diffusivity, and surface tension ofsolutes in biphasic ionic liquid systems. Coupling CO2 overcomes many of the challenges of ionic liquids: high viscosity/low diffusivity; low solubility of reactions gases/substrates; difficult separation of mixtures with ILs; and most ionic salts are solid not liquid. However, there are nostudies concerned with the interfacial mass transfer in biphasic ionic liquids/CO2 systems. This proposal will uniquely investigate the beneficial properties of ionic liquids related to mass transfer. The mass transfer data will be obtained using advanced imaging and processing ofpendant and flowing droplets with a detailed hydrodynamic model.Broader Impact:A thorough understanding of the fundamentals of ionic liquid mass transport properties will allow process intensification and industrial application, which could lead to a decrease in the exposure to both society and the environment. In addition, novel processes with ILs that have achieved high levels of efficiency will also be available to the public. Compressed CO2 or, insome cases, a wise choice of conventional solvents, may also lead to the realization of the potential environmental advantage of ionic liquids. This project will introduce students to the necessary experimental and theoretical modeling skills to properly design environmentally benign alternatives and critically compare them to conventional technology. Moreover, theentire process will lead to incorporation of excellent case-studies in current courses at the University of Kansas: Environmentally-Benign Reaction Engineering and Environmental Assessment of Chemical Processing. Exhibits will be demonstrated at local events at KU, such as the "Carnival of Chemistry" and Engineering "EXPO" for undergraduate and high-schoolstudents. The PI has currently recruited a female African student for work on this project to promote diversity in education.