Acid Hydrotropic Fractionation of Lignocelluloses for Sustainable Biorefinery: Advantages, Opportunities, and Research Needs.
Acid Hydrotropic Fractionation of Lignocelluloses for Sustainable Biorefinery: Advantages, Opportunities, and Research Needs.
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DOI：
10.1002/cssc.202100915
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发表时间：
2021-05
期刊：
影响因子：
8.4
通讯作者：
J. Zhu;Liheng Chen;Cheng Cai
中科院分区：
文献类型：
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作者：
J. Zhu;Liheng Chen;Cheng Cai
本文综述了酸性水溶助长剂在生物炼制应用中可持续分离木质纤维素的潜力。酸水溶助长剂是一类对木质素具有水溶助长剂性质的酸，其有助于在水性体系中溶解木质素。由于能够裂解醚键和酯键以及甚至木质素-碳水化合物复合物（LCC）键，因此这些酸水溶助长剂可以分离嵌入植物生物质细胞壁中的木质素，并随后将分离的木质素溶解在水性体系中。两种酸水溶助长剂，即，评价和比较了芳族磺酸对甲苯磺酸（p-TsOH）和二羧酸马来酸（MA）在脱木质素和溶解半纤维素以及减少木质素缩合方面的效果。通过MA的木质素酯化的优点，生产纤维素糖通过酶水解和含木质素的纤维素纳米纤维（LCNFs）通过机械原纤化从分级的水不溶性固体（WIS），并获得较少的缩合与浅色的木质素，被证明。通过与其他分级工艺的WIS进行比较，也证明了MAHF WIS具有优异的酶消化性。综述了酸性水溶助长剂的可回收性和可重复使用性。最后，还提出了未来研究需要解决商业化的关键技术问题的观点。
This mini review provides a comprehensive discussion on the potential of using acid hydrotropes for sustainably fractionating lignocelluloses for biorefinery applications. Acid hydrotropes are a class of acids that have hydrotrope properties toward lignin, which helps to solubilize lignin in aqueous systems. With the capability of cleaving ether and ester bonds and even lignin-carbohydrate complex (LCC) linkages, these acid hydrotropes can therefore isolate lignin embedded in the plant biomass cell wall and subsequently solubilize the isolated lignin in aqueous systems. Performances of two acid hydrotropes, i.e., an aromatic sulfonic acid, p -toluenesulfonic acid ( p -TsOH), and a dicarboxylic acid, maleic acid (MA), in terms of delignification and dissolution of hemicelluloses, and reducing lignin condensation, were evaluated and compared. The advantages of lignin esterification by MA for producing cellulosic sugars through enzymatic hydrolysis and lignin-containing cellulose nanofibrils (LCNFs) through mechanical fibrillation from the fractionated water insoluble solids (WIS), and for obtaining less condensed lignin with light color, were demonstrated. The excellent enzymatic digestibility of MAHF WISs was also demonstrated by comparing with WISs from other fractionation processes. The recyclability and reusability of acid hydrotropes were also reviewed. Finally, perspectives on future research needs to address key technical issues for commercialization were also provided.