Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China.
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China.
Waste Manag. 2020 May 1;108:70-77. doi: 10.1016/j.wasman.2020.04.023. Epub 2020 Apr 24.
Levoglucosan is served as a significant versatile product to generate high value-added chemicals and pharmaceutical additives. Levoglucosan was predominately produced from pyrolysate of cellulose. However, the direct fast pyrolysis of waste biomass produces a small quantity of levoglucosan in comparison with the theoretical value of cellulose. This study explored Fenton pretreatment as a possible route to enhance levoglucosan yield during the fast pyrolysis of the waste corncob. The experimental results showed that different Fenton pretreated conditions and pyrolytic temperatures played vital roles in the formation of levoglucosan. The levoglucosan yield from fast pyrolysis at 500 °C of corncob pretreated by Fenton reaction of 14 mL/g HO and 16 mM FeSO was about 95% higher than that of the untreated corncob. Additionally, Fenton pretreated corncob was capable of obtaining the levoglucosan at a low pyrolytic temperature (300 °C). It was mainly attributed to the effective disrupting of biomass structures and the selective degradation of lignin and hemicellulose during pretreatment. Furthermore, the powerful removal of alkali and alkaline earth metals during Fenton pretreatment was beneficial to increasing the levoglucosan yield. These findings demonstrate that Fenton pretreatment can provide a novel effective method to enhance levoglucosan yield during biomass fast pyrolysis.
左旋葡聚糖是一种重要的多功能产品，可用于生产高附加值的化学品和药物添加剂。左旋葡聚糖主要由纤维素热解产物生成。然而，与纤维素的理论值相比，废生物质的直接快速热解产生的左旋葡聚糖数量较少。本研究探讨了芬顿预处理作为一种提高废玉米芯快速热解过程中左旋葡聚糖产量的可能途径。实验结果表明，不同的芬顿预处理条件和热解温度对左旋葡聚糖的形成起着至关重要的作用。在 500°C 下进行快速热解时，用 14 毫升/克 HO 和 16 毫摩尔 FeSO 进行芬顿反应预处理的玉米芯的左旋葡聚糖产率比未经处理的玉米芯高约 95%。此外，经过芬顿预处理的玉米芯能够在较低的热解温度（300°C）下获得左旋葡聚糖。这主要归因于预处理过程中生物质结构的有效破坏以及木质素和半纤维素的选择性降解。此外，芬顿预处理过程中强碱和碱土金属的有效去除有利于提高左旋葡聚糖的产率。这些发现表明，芬顿预处理可以为提高生物质快速热解过程中左旋葡聚糖的产量提供一种新的有效方法。
