摘要
丰富、可再生的木质纤维素生物质在代替化石资源制备化学品和功能材料方面具有巨大的潜力,但是,木质纤维素生物质的天然抗降解性严重制约着其有效利用,需要通过预处理打破木质纤维素的天然抗降解屏障,才能更好利用木质纤维素生物质。以低共熔溶剂(DESs)为溶剂的预处理技术是新兴的生物质预处理技术,在木质纤维素预处理方面展现出良好的应用前景。笔者综述了近年来氯化胆碱(ChCl)基DESs用于生物质预处理的研究概况,讨论了ChCl基DESs的物化性质与预处理性能之间的关联性,系统总结了以羧酸、醇、氨基或者酰胺基为氢键供体的DESs在木质纤维素预处理方面的应用,重点分析了预处理温度及时间、氢键供体的结构及其与ChCl的物质的量比、固液比等因素对预处理性能的影响。此外,还讨论了ChCl基DESs与其他辅助技术结合在生物质预处理中的应用、ChCl基DESs的回收、预处理后木质纤维素各组分的再生等。最后,展望了DESs预处理技术面临的挑战及可能的发展方向。
To achieve the goal of carbon neutrality,utilization of renewable resources and energies has gained worldwide interest.In this contest,the abundant,cheap and renewable lignocellulosic biomass has great potential to be an alternative to fossil resources for producing valuable chemicals and functional materials because the utilization of lignocellulosic biomass has shown the unique “net-zero carbon emission” nature,thus making its utilization become a hotspot in chemical community.However,the natural resistance to degradation of lignocellulosic biomass seriously restricts its effective utilization.Therefore,it is essential to break the natural anti-degradation barrier of lignocellulose by pretreatment to achieve better utilization of lignocellulose.To date,various strategies have been developed to pretreat lignocellulose,including physical methods(e.g.,grinding),chemical methods(e.g.,alkalis,acids,organic solvents,ionic liquids,deep eutectic solvents and enzymatic hydrolysis),and the combination of both physical and chemical methods(e.g.,wet oxidation and hydrothermal cracking).Of these developed strategies,pretreatment of lignocellulosic biomass using deep eutectic solvents(DESs,a newly developed functional green solvents) is consi-dered as an emerging technology,which has shown good applications in the pretreatment of lignocellulosic biomass.This study discussed the progress on the pretreatment of lignocellulosic biomass using choline chloride(ChCl)-based DESs in recent years.The correlation between the pretreatment performance and the physical and chemical properties(i.e.,density,viscosity,ionic conductivity and polarity) of the ChCl-based DESs was reviewed.Moreover,the applications of ChCl-based DESs with various carboxylic acids,alcohols,aminos or amides as hydrogen bond donors in lignocellulosic biomass treatment were systematically analyzed and discussed.Especially,the influence of various parameters,i.e.,pretreatment temperature,pretreatment time,the structure of hydrogen bond donors and its molar ratio with ChCl,and solid-to-liquid ratio,on the pretreatment performance were discussed in detail.Additionally,the performance of combining ChCl-based DESs and other auxiliary technologies(i.e.,microwave,ultrasonic sound,additives,hydrothermal,extrusion,and bio-pretreatment) on biomass pretreatment,the techniques(i.e.,anti-solvents,extraction,and membrane filtration) for the recovery of ChCl-based DESs,and the regeneration of lignocellulose components from the pretreatment systems were reported.Finally,an outlook was provided to highlight the challenges and opportunities associated with the pretreatment of lignocellulosic biomass by utilizing DESs,and several key problems to be addressed in future works were discussed based on the authors' knowledge.According to the discussions in this review,it is no doubt that the utilization of DESs as the efficient solvents for the pretreatment of lignocellulosic biomass is highly promising.We believe that this review could provide useful information for the readers working in this interesting and important area.
作者
薛智敏
闫何恋
XUE Zhimin;YAN Helian(Beijing Key Laboratory of Lignocellulosic Chemistry,Beijing Forestry University,Beijing 100083,China)
出处
《林业工程学报》
CSCD
北大核心
2024年第1期32-44,共13页
Journal of Forestry Engineering
基金
国家自然科学基金(21873012)
国家高层次人才特殊支持计划项目。
