Zhang Yingchuan, Xu Feixiang, Chen Fenglin, Zhang Yanru, Wu Yaxiang, Jiang Liqun
State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha, China.
Institute of Biological and Medical Engineering, Guangdong Academy of Sciences, Guangzhou, China.
Front Chem. 2022 Mar 10;10:847767. doi: 10.3389/fchem.2022.847767. eCollection 2022.
Glycerol waste was combined with microwave to pretreat lignocellulose before fast pyrolysis. After pretreatment, most alkali and alkaline earth metals (87.9%) and lignin (52.6%) were removed, and a higher crystallinity was obtained. Comparatively, glycerol waste combined with microwave was proven to be more efficient than glycerol with conventional heating. During fast pyrolysis, higher content of levoglucosan in glycerol waste-pretreated products (27.5%) was obtained, compared with those pretreated by pure glycerol (18.8%) and untreated samples (5.8%). Production of fermentative toxic aldehyde and phenol by-products was also inhibited after glycerol waste treatment. Following mechanistic study had validated that microwave in glycerol waste solvent could effectively ameliorate structure and components of lignocellulose while selectively removing lignin. Notably, under the optimal condition, the levoglucosan content in pyrolytic products was enhanced significantly from 5.8% to 32.9%. In short, this study provided an archetype to dually utilize waste resources for ameliorating lignocellulose structure and precisely manipulating complex fast pyrolysis.
甘油废料与微波结合，在快速热解之前对木质纤维素进行预处理。预处理后，大部分碱金属和碱土金属（87.9%）以及木质素（52.6%）被去除，并获得了更高的结晶度。相比之下，事实证明甘油废料与微波结合比传统加热的甘油更有效。在快速热解过程中，与纯甘油预处理的产物（18.8%）和未处理的样品（5.8%）相比，甘油废料预处理产物中左旋葡聚糖的含量更高（27.5%）。甘油废料处理后，发酵性有毒醛类和酚类副产物的产生也受到抑制。后续的机理研究证实，甘油废料溶剂中的微波能够有效改善木质纤维素的结构和成分，同时选择性地去除木质素。值得注意的是，在最佳条件下，热解产物中左旋葡聚糖的含量从5.8%显著提高到32.9%。简而言之，本研究为双重利用废弃资源以改善木质纤维素结构和精确控制复杂的快速热解提供了一个范例。
