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

项目编号：CBET- 0731244首席研究员：Aaron M. scurtuniversity /Institution: University of Kansas Center for research标题：理解有机溶剂和压缩CO2离子液体（ILs）的双相离子液体系统中的界面质量传输现象，由于它们缺乏蒸汽压力和分子“可调”的性质，离子液体（ILs）被吹捧为下一类环保溶剂。新型离子液体及其在提取、反应和材料处理等方面的新应用正在迅速发展。将ILs与有机溶剂结合的系统，特别是与压缩CO2结合的系统，在工艺开发方面具有许多优势。压缩二氧化碳改善了许多挑战（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双相系统的过程强化。没有对传质系数和相关现象的理解，传质系数的广泛应用是不可能发生的。因此，本研究将尝试建立一个使用几种模型离子液体、溶剂和溶质的工艺开发的基本方法。先进的理论和建模技术将被用于快速实现任何特定的或未来的离子液体。智力优势：离子液体在各种提取、反应和材料处理应用中发现了许多潜在的用途。由于普通的分离技术，如蒸馏，在某些分离中是不可行的，人们对双相流体的应用越来越感兴趣。然而，为了优化工艺，必须了解界面传质。即使是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存在。这一建议将代表双相离子液体体系中溶质的传质系数、粘度、扩散系数和表面张力的第一个系统的实验和理论研究。耦合CO2克服了离子液体的许多挑战：高粘度/低扩散率；反应气体/底物溶解度低；用ILs分离混合物困难；大多数离子盐是固体而不是液体。然而，目前尚无关于离子液体/CO2双相体系中界面传质的研究。本提案将独特地研究与传质有关的离子液体的有益性质。传质数据将使用先进的成像和处理技术，通过详细的流体动力学模型获得悬浮和流动的液滴。更广泛的影响：对离子液体质量输运性质的基本原理的透彻理解将允许过程强化和工业应用，这可能导致对社会和环境的暴露减少。此外，还将向公众提供具有高效率的ILs的新工艺。压缩二氧化碳，或者在某些情况下，明智地选择传统溶剂，也可能导致离子液体潜在的环境优势的实现。本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方案，并将其与传统技术进行批判性比较。此外，整个过程将导致将优秀的案例研究纳入堪萨斯大学当前的课程：环境良性反应工程和化学加工的环境评估。展品将在堪萨斯大学的当地活动中进行展示，如“化学嘉年华”和面向本科生和高中生的工程“博览会”。PI目前已招募一名非洲女学生参与这个促进教育多样性的项目。

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.