Fundamental Understanding of HDA Process: One-Step Conversion of Lignocellulosic Biomass to Furan-Based Precursors for Drop-in Liquid Fuel

PI：PAN，学军建议编号：1236562机构：威斯康星大学麦迪逊分校题目：HDA过程的基本理解：木质纤维素生物质一步转化为呋喃类前体用于插入式液体燃料本项目旨在从根本上了解一种创新的生产工艺(HDA：水解-脱水-羟醛缩合)生产？插入式？来自木质纤维生物质的生物燃料。该工艺在温和的条件下(120-140°C)一步将生物质中的纤维素和半纤维素直接转化为基于呋喃的燃料级碳氢化合物前体，而无需事先对生物质进行预处理和分馏。前体可以很容易地通过加氢/脱水转化为燃料级碳氢化合物。具体地说，生物质在丙酮为溶剂和反应物、卤化盐(如溴化锂)和无机酸催化下，经历了纤维素和半纤维素的水解制得单糖，单糖脱水成糠醛和羟甲基糠醛(HMF)，以及HMF和糠醛与丙酮的羟醛缩合反应，最终形成链长为C6~C21的呋喃基前体。同时，从生物质中提取的木质素纯度高、相对分子质量低、反应性好，在木质素联产产品开发中显示出巨大的潜力。该项目的具体目标是(1)进一步优化HDA工艺，以提高呋喃类含氧前体的转化率和选择性，并建立工艺质量平衡；(2)阐明细胞壁成分(纤维素和半纤维素)的反应途径，从根本上了解HDA工艺；(3)表征提取的HDA木质素的化学、物理和热学性质。除了创新的研究活动外，本项目还强调高质量的教育、新知识的开发和传播以及推广活动。拟议工艺的成功将为利用木质纤维生物质生产简易液体燃料提供一种替代和创新的方法，这些生物质包括农业作物残渣(玉米秸秆)、能源作物(柳枝菊)和森林生物质(木材)。综合教育计划将面向广泛的学生。除了普通本科生和研究生外，还将特别关注高中生和代表不足的群体的学生，鼓励他们参加关于生物能源的暑期项目。

PI: Pan, XuejunProposal Number: 1236562Institution: University of Wisconsin-MadisonTitle: Fundamental Understanding of HDA Process: One-Step Conversion of Lignocellulosic Biomass to Furan-Based Precursors for Drop-in Liquid FuelThis project is to fundamentally understand an innovative process (HDA: hydrolysis- dehydration-aldol condensation) for producing ?drop-in? biofuel from lignocellulosic biomass. The process directly converts cellulose and hemicellulose in the biomass to furan-based precursors for fuel-grade hydrocarbons in one step under mild conditions (120-140°C) without prior biomass pretreatment and fractionation. The precursors can be easily converted to fuel- grade hydrocarbons via hydrogenation/dehydration. Specifically, in the presence of acetone as solvent and reactant and halide salt (such as lithium bromide) and mineral acid as catalysts, the biomass undergoes hydrolysis of cellulose and hemicellulose to monosaccharides, dehydration of the monosaccharides to furfural and hydroxymethylfurfural (HMF), and aldol-condensation of HMF and furfural with acetone, and ends up with the formation of furan-based precursors with chain length of C6?C21. Meanwhile, lignin in the biomass is extracted with high purity, low molecular weight, and good reactivity, showing great potential in lignin co-products development. The unreacted acetone and catalysts can be recycled and reused.The specific objectives of this project are (1) to further optimize the HDA process to improve the conversion yield and selectivity of the furan-based oxygenate precursors and to establish process mass balance; (2) to elucidate the reaction pathways of cell-wall components (cellulose and hemicellulose) and to fundamentally understand the HDA process; (3) to characterize chemical, physical and thermal properties of the extracted HDA lignin.In addition to innovative research activities, this project also emphasizes on high-quality education, development and dissemination of new knowledge, and outreach activities. The success of proposed process would provide an alternative and innovative approach for producing drop-in liquid fuel from lignocellulosic biomass, such as agricultural crop residues (corn stover), energy crop (switchgrass), and forest biomass (wood). The integrated education plan will target broad range of students. In addition to regular undergraduate and graduate students, special attention will be paid to the students from high school and underrepresented groups by encouraging them participating summer projects on bioenergy.