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SusCHEM: Mixtures of Ionic Liquids with Compressible Fluids for Biopolymer Separations and Processing of Lignocellulosic Materials

SusCHEM：离子液体与可压缩流体的混合物，用于木质纤维素材料的生物聚合物分离和加工

基本信息

批准号：
1509390
负责人：
Erdogan Kiran
金额：
$ 29.99万
依托单位：
Virginia Polytechnic Institute and State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2015
资助国家：
美国
起止时间：
2015-07-01 至 2021-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1509390&HistoricalAwards=false
关键词：
SusCHEM Mixtures Ionic Liquids Compressible

项目摘要

1509390KiranVA Polytechnic InstThe proposed research program will explore a novel approach for separation of the biopolymers of lignocellulosic materials or woody biomass. The successful outcomes are expected to lead to purified cellulose and hemicellulose fractions that are free of extractives and lignin; or to purified lignin fractions that are free of carbohydrates. The possibility of generating uniform cellulose resources that are free of extractives and lignin is of high technological significance. Such a resource would greatly improve the efficiency and the sustainable production of biofuels such as bioethanol; or may be used as advanced fiber source for paper manufacture, or for production of cellulosic aerogels or scaffolds. The possibility of generating a uniform lignin resource is also of high significance. If it were available, such a resource could be used for possible conversion to nonpetroleum-based, hydrocarbon-like transportation fuels, or for conversion to advanced materials such a carbon fibers or porous adsorbents. As solvent media, the project will explore mixtures of selected ionic liquids with a supercritical or compressible fluid such as carbon dioxide plus an organic solvent. The approach is non-traditional in that the focus will be on using the ionic liquids not as the major, but as a minor component of the mixtures. The objective is to incorporate the functionality or solvating power of the ionic liquids to mixtures of an organic solvent with a more compressible supercritical fluid at a level that would be just sufficient for separation and processing of biopolymers. The methodology is to combine the pressure-tunability of compressible fluids with the solvating power of ionic liquids while at the same time lowering the viscosity of the medium for easier processability. The goal is to develop solvent-antisolvent combinations that can be tuned for selective dissolution and precipitation of target polymers with manipulations of pressure and /or temperature, while at the same time facilitating the recovery and the recycle of the ionic liquids employed. Towards these objectives, the project will generate fundamental data on the high-pressure miscibility, volumetric properties, solubility parameters and viscosity of mixtures of selected ionic liquids with compressible fluids and their mixtures with the biopolymers of interest as a function of the fluid composition, pressure and temperature. The proposed combination of ionic liquids with compressible or supercritical fluid mixtures at high pressures are expected to provide new process flexibilities in terms of pressure, temperature, or compositional tuning of (a) the thermodynamic conditions for miscibility and phase separation, or (b) the transport properties such as viscosity, or (c) the kinetics with respect to either chemical reactivity and transformations, or (d) the thermophysical transitions and morphological modifications.

1509390 KiranVA Polytechnic InstThe拟议的研究计划将探索一种新的方法，用于分离木质纤维素材料或木质生物质的生物聚合物。预期成功的结果将导致不含提取物和木质素的纯化的纤维素和半纤维素级分;或导致不含碳水化合物的纯化的木质素级分。产生不含提取物和木质素的均匀纤维素资源的可能性具有很高的技术意义。这种资源将大大提高生物燃料如生物乙醇的效率和可持续生产;或者可以用作造纸的高级纤维源，或者用于生产纤维素气凝胶或支架。产生均匀的木质素资源的可能性也具有高度意义。如果可以获得，这种资源可以用于可能的转化为非石油基的烃类运输燃料，或转化为先进材料，如碳纤维或多孔吸附剂。作为溶剂介质，该项目将探索选定的离子液体与超临界或可压缩流体（如二氧化碳）和有机溶剂的混合物。该方法是非传统的，因为重点将是使用离子液体作为混合物的次要组分，而不是主要组分。目的是将离子液体的官能度或溶剂化能力以刚好足以分离和加工生物聚合物的水平并入有机溶剂与更可压缩的超临界流体的混合物中。该方法是将可压缩流体的压力可调性与离子液体的溶剂化能力结合联合收割机，同时降低介质的粘度以便于加工。目标是开发溶剂-抗溶剂组合，其可以通过控制压力和/或温度来调节目标聚合物的选择性溶解和沉淀，同时促进所用离子液体的回收和再循环。为了实现这些目标，该项目将生成关于选定离子液体与可压缩流体的混合物及其与感兴趣的生物聚合物的混合物的高压溶解性、体积性质、溶解度参数和粘度的基本数据，作为流体组成、压力和温度的函数。所提出的离子液体与可压缩或超临界流体混合物在高压下的组合预期在以下方面提供新的工艺灵活性：（a）溶解性和相分离的热力学条件，或（B）输送性质如粘度，或（c）关于化学反应性和转化的动力学，或（d）热物理转变和形态改变。