以甘草渣为研究对象,9种氯化胆碱为氢键供体的低共熔溶剂（DES）作为溶剂,对甘草渣进行预处理,研究不同反应温度与反应时间对甘草渣理化特性的影响。醇类DES中,乙二醇/氯化胆碱的预处理效果最好,在150 ℃,1 h条件下最大木质素脱除率为38.33%。酸类DES中,乳酸/氯化胆碱在100 ℃,1 h处理条件下木质素脱除率最高为40.87%,纤维素保留率高达95.28%。碱类DES中,乙醇胺/氯化胆碱在4 h,150 ℃处理条件下木质素脱除率最大为73.02%。物理表征结果说明,DES可破坏纤维素分子内氢键,断开碳水化合物与木质素的酯键,使纤维素可及表面积增大,有利于后续利用。
Abstract
The solvent pretreatment of glycyrrhiza residue using deep eutectic solvents（DESs） as solvents with nine choline chloride（ChCl） as hydrogen bond donors was conducted. The effects of DESs compositions and treating conditions on chemical compositions and physical morphology were analyzed. Among alcohol DESs, glycol/ChCl shows maximal lignin removal rate of 38.33% under the pretreatment conditions of 150 ℃, 1 h. For the acidic DESs, maximal lignin removal rate of 40.87% with cellulose recovery of 95.28% is observed after the treatment by lactic acid/ChCl under the conditions of 100 ℃, 1 h. Among the basic DESs, the maximal lignin removal rate of 73.02% is achieved by ethanolamine/ChCl under the conditions of 150 ℃, 4 h. Physical characteristics analysis indicates that DES destroys intramolecular hydrogen bonds of cellulose, breaks the ester bonds between carbohydrate and lignin, increases the accessible surface area of cellulose, which is conducive for subsequent utilization.
关键词
废物利用 /
木质纤维素生物质 /
去木质作用 /
甘草渣 /
低共熔溶剂 /
理化特性分析
Key words
waste utilization /
lignocellulosic biomass /
delignification /
glycyrrhiza residue /
deep eutectic solvent /
physicochemical characteristics
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基金
国家自然科学基金（51876206; 52276192）; 广州市重点研发项目（202103000011）
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