Gas phase catalysis of mixtures of mono-saccharides derived from hydrolysing lignocellulosic biomass with gamma-valeractone

用γ-戊内酯水解木质纤维素生物质衍生的单糖混合物的气相催化

• 批准号: RGPIN-2016-06420
• 负责人: Patience, Gregory
• 金额: $ 4.74万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=710283
• 关键词: Gas; phase; catalysis; mixtures; mono

Mono-saccharides derived from lignocellulosic biomass have the potential to replace petroleum as a feedstock to produce specialty chemicals. The U.S. Department of Energy identified the Top 12 value added molecules from biomass. Glucose is a feedstock of four of these building blocks: succinic acid, 2,5 - furan dicarboxylic acid, glucaric acid and sorbitol. The reactions include partial oxidation (gluconic acid or lactic acid), hydrogenation (sorbitol) and oxidative dehydration (furans). Chemicals derived from furans are worth 3 times the price of refined glucose. The price of acrylic acid exceeds 2000 $/t (6 times refined glucose), which makes it an attractive target molecule. Process platforms to convert lignocellusic biomass include: (1) thermochemical; (2) enzymatic or chemical hydrolysis then fermentation; and (3) chemical hydrolysis and dehydration followed by catalytic upgrading. Thermochemical processes are poorly efficient and require additional steps to make fuels (either syngas to diesel, or pyrolysis oils that need to be purified). Fermentation requires long residence times and produces dilute solutions. Separation costs and energy requirements can be considerable and finally the large volumes of water must be treated. The latter process catalyses the reaction with low concentrations of acid and water and gamma-valeractone (GVL) as solvent. The cellulose is converted to 6-carbon sugars (C6), while the hemicellulose hydrolyzes to 5-carbon sugars (C5). After treating the GVL solution with CO2 at high pressure, a purification stage is required to neutralize the solution and reduce the GVL concentration further, otherwise it inhibits microbial growth. In this programme, rather than purifying the mixture of sugars and GVL, we inject the solution directly into a catalytic fluidized bed operating at temperatures greater than 400 oC. We have already demonstrated that mixed metal oxides catalyse xylose and glucose to similar carboxylic acids in fluidized beds operating in the gas phase. The hurdles that remain include atomizing a solution with a mixture of glucose, xylose and GVL, synthesizing a selective catalyst, producing fluidized bed micro-spheres and scaling up the reactor. The principal objective of this research program is to demonstrate high yields of carboxylic acids in a fluidized bed at a scale of 500 g. We subdivide the program into three projects: (1) select a catalyst system that converts monosaccharides/GVL/water solutions to carboxylic acids; (2) develop catalyst manufacturing capabilities to form attrition resistant micro-spheres either by spray drying, spray pyrolysis or wet impregnation; and (3) scale up the fluidized bed process particularly criteria to design the spargers for non-volatile substrates in aqueous solutions.

从木质纤维素生物质中提取的单糖有可能取代石油作为生产特种化学品的原料。美国能源部确定了来自生物质的前12大增值分子。葡萄糖是四种基本成分的原料：琥珀酸、2,5 -呋喃二羧酸、葡萄糖酸和山梨醇。反应包括部分氧化（葡萄糖酸或乳酸）、加氢（山梨醇）和氧化脱水（呋喃）。从呋喃中提取的化学物质的价格是精制葡萄糖的3倍。丙烯酸的价格超过2000美元/吨（是精制葡萄糖的6倍），使其成为极具吸引力的靶分子。