Phloem biomass has gradually attracted attention for its conversion and utilization due to its fast growth rate and suitability for textile use. Currently, clean methods for separating the chemical components of biomass have attracted attention. In this study, the choline chloride-lactic acid (CLA) and choline chloride-glycolic acid (CGA) pretreatment were developed for kenaf chemical components separation, and the solid residue and regenerated lignin were characterized. The results demonstrated that two acidic deep eutectic solvents (DESs) pretreatment had good removal capacities for lignin and hemicellulose even when the kenaf was not crushed. Under optimal treatment conditions, the retention rates of cellulose were 82.4% and 81.1%, respectively. The cellulose content in the recovery solids residues reached 91.5% and 91.3%, which also resulted in good enzymatic hydrolysis conversion efficiency (85.4% and 84.9%). The regenerated lignin exhibited high purity (91.9% and 90.1%), and low molecular weight (1209 and 1086 g/mol), which was attributed to the amount of ether bonds cleavage in lignin. Meanwhile, the DES exhibited a good ability to recycle and reuse. Overall, acidic DES pretreatment holds promise for efficient fractionation and component utilization of kenaf phloem biomass.

中文翻译：

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使用可回收酸性 DES 有效分馏红麻化学成分

韧皮部生物质因其生长速度快、适合纺织用途而逐渐受到人们的关注。目前，分离生物质化学成分的清洁方法引起了人们的关注。本研究开发了氯化胆碱-乳酸（CLA）和氯化胆碱-乙醇酸（CGA）预处理方法用于红麻化学成分分离，并对固体残渣和再生木质素进行了表征。结果表明，即使红麻没有被粉碎，两种酸性低共熔溶剂（DES）预处理对木质素和半纤维素也具有良好的去除能力。在最佳处理条件下，纤维素保留率分别为82.4%和81.1%。回收固体残渣中的纤维素含量分别达到91.5%和91.3%，这也带来了良好的酶解转化效率（85.4%和84.9%）。再生木质素表现出高纯度（91.9%和90.1%）和低分子量（1209和1086 g/mol），这归因于木质素中醚键断裂的量。同时，DES表现出良好的回收和再利用能力。总体而言，酸性 DES 预处理有望实现红麻韧皮部生物质的有效分馏和成分利用。