Biomass Conversion and Biorefinery ( IF 3.5 ) Pub Date : 2022-01-17 , DOI: 10.1007/s13399-022-02332-4 Sadia Naz 1 , Maliha Uroos 1 , Nawshad Muhammad 2
|
Lignocellulosic bioresources are the most significant renewable primary energy reserves for development of sustainable industries. Generation of biofuels, platform chemicals and materials from the non-edible bio-feedstocks and inferring such scientific developments into commercial reality are much more needed these days. Many efforts are ongoing worldwide to develop cheap second-generation biofuel production methods for commercialization. In this study, four times cheaper pyridinium-based ionic liquids (ILs) as compared to the most widely used imidazolium ILs are reported for one-pot carbohydrate conversion and simultaneous lignin extraction from non-food lignocellulosic biomasses. Process was first optimized for fructose, glucose, galactose, and microcrystalline cellulose (MCC), and > 99% yield was obtained from fructose with [C6Py]Cl without any other catalyst at 80 °C in 2 h reaction time. For conversion of glucose and cellulose, CrCl3 came out as best isomerization and saccharification catalyst along with [C4C1Py]Cl yielding 82 and > 70% at 100 and 120 °C respectively. Same Lewis acidic IL system yielded 20‒35% 5-HMF from agricultural residues as well as dry fruit shells based on their whole carbohydrate contents. Maximum carbohydrate conversion was observed for wheat husk (97%) while lignin recovery was highest for rice husk (65%). Analyses of products were carried out using UV, FTIR, HPLC, 1H NMR, and GC–MS.
Graphical abstract
中文翻译：
使用具有成本效益的离子液体一锅法生产 5-羟甲基糠醛并同时从非食品木质纤维素废物中回收木质素
木质纤维素生物资源是可持续产业发展最重要的可再生一次能源储备。如今，更需要从不可食用的生物原料中生产生物燃料、平台化学品和材料，并将此类科学发展推向商业现实。世界范围内正在进行许多努力以开发用于商业化的廉价第二代生物燃料生产方法。在这项研究中，据报道，与最广泛使用的咪唑离子液体相比，吡啶离子液体 (ILs) 便宜四倍，可用于一锅碳水化合物转化和同时从非食品木质纤维素生物质中提取木质素。工艺首先针对果糖、葡萄糖、半乳糖和微晶纤维素 (MCC) 进行了优化，从果糖中获得 > 99% 的产率 [C]6 Py]Cl 没有任何其他催化剂，在 80 °C 下反应 2 小时。对于葡萄糖和纤维素的转化，CrCl 3与 [C 4 C 1 Py]Cl 在 100 和 120 °C 下的产率分别为 82% 和 > 70%，是最好的异构化和糖化催化剂。相同的 Lewis 酸性 IL 系统从农业残留物和干果壳中产生 20-35% 的 5-HMF，基于其全部碳水化合物含量。小麦壳的碳水化合物转化率最高（97%），而稻壳的木质素回收率最高（65%）。使用 UV、FTIR、HPLC、 1 H NMR 和 GC-MS对产物进行分析。
京公网安备 11010802027423号