Hydrolysis of Cellulose and Lignocellulosic Biomass into Fermentable Sugars using Acidic Ionic Liquid Medium

0929970 Amarasekara该项目的目标是开发一种有效且环保的水解方法，用于从木质纤维素生物质中生产葡萄糖和其他可发酵糖。由丰富的木质纤维素生物质产生的葡萄糖和其它可发酵糖提供了乙醇生产的经济途径。这一预期目标将通过开发一种可回收的酸性离子液体溶剂体系来实现，该溶剂体系可以容易地溶解木质纤维素生物质，并且还可以充当水解催化剂。在项目的初期阶段，将以1-甲基咪唑、三乙醇胺和吡啶为碱合成三种不同类型的酸性离子液体。将测试这些酸性离子液体在热、微波和超声条件下溶解纤维素的能力。然后将所得纤维素酸性离子液体溶液用水稀释至临界浓度，并允许通过离子液体中的内部-SO 3 H基团水解，作为催化剂。将通过HPLC分析水解过程中产生的葡萄糖及其低聚物。此外，将通过3，5-二硝基水杨酸或碱性铜方法分析形成的总还原糖。在该项目的第二阶段，将合成具有内置超强酸基团（-CF2-SO 3 H）的酸性离子液体，然后进行类似的纤维素溶解和水解测试，以研究超强酸基团的催化作用。在第三阶段中，将研究使用酸性/超强酸离子液体溶解和水解木质纤维素生物质（玉米秸秆、柳枝稷、芒草、木片）为可发酵糖。在第四阶段的项目中，将研究优化反应条件以产生最大产率的可发酵糖，以及这些酸性离子液体的回收和循环利用。该项目的智力优点是：（a）酸性/超强酸离子液体既是溶剂又是催化剂，因此不需要酸中的废物和酸催化剂的分离（B）在温和的温度和大气压下的单步溶解和水解（c）超强酸离子液体是一个新概念。该项目的更广泛影响是：（a）少数群体的参与，因为该项目将在Prairie View AM大学进行，这是一所历史悠久的黑人大学（B）博士后研究助理、研究生和本科生将参与该项目，为他们提供专业发展、研究培训和教育（c）通过在会议、小组会议上介绍成果和在期刊上发表文章，广泛传播有关可持续能源技术的知识。

0929970AmarasekaraThe goal of this project is to develop an efficient and environmentally sound hydrolysis method useful for the production of glucose and other fermentable sugars from lignocellulosic biomass. The glucose and other fermentable sugars produced from abundant lignocellulosic biomass provide an economical path to ethanol production. This anticipated goal would be achieved by the development of a recyclable acidic ionic liquid solvent system that can easily dissolve lignocellulosic biomass and act as the hydrolysis catalyst as well. In the initial stage of the project three different types of acidic ionic liquids will be synthesized by using 1-methylimidazole, triethanolamine and pyridine as bases. These acidic ionic liquids will be tested for their ability to dissolve cellulose under thermal, microwave, and sonication conditions. The resulting cellulose-acidic ionic liquid solutions will be then diluted with water to a critical concentration and allowed to hydrolyze by the internal -SO3H group in the ionic liquid, acting as the catalyst. Glucose and its oligomers produced in the hydrolysis will be analyzed by HPLC. Furthermore, the total reducing sugars formed will be analyzed by 3,5-dinitrosalicylic acid or alkaline copper methods. In the second stage of the project acidic ionic liquids with a built-in superacid group (-CF2-SO3H) will be synthesized and then similarly tested for the dissolution and hydrolysis of cellulose to study the catalytic effect of the superacid group. In the third phase, the use of acidic/superacid ionic liquids for the dissolution and hydrolysis of lignocellulosic biomass (corn stover, switch grass, miscanthus grass, wood chips) to fermentable sugars will be investigated. In the fourth phase of the project optimization of reaction conditions to produce the maximum yield of fermentable sugars, recovery and recycling of these acidic ionic liquids will be studied.The intellectual merits of the project are (a) acidic/superacid ionic liquid is the solvent and the catalyst as well, therefore no waste in acid and no separation of acid catalyst is necessary (b) single step dissolution and hydrolysis under mild temperatures and atmospheric pressure (c) superacid ionic liquid is a novel concept. Broader impacts of the project are (a) participation of minorities, as this project will be carried out at Prairie View A&M University, which is a historically black university (b) postdoctoral research associates, graduate and undergraduate students will participate in the project providing them professional development, research training and education (c) broad dissemination of knowledge about sustainable energy technologies by presentation of the results at conferences, group meetings, and publications in journals.