AlCl_(3)促进毛竹低共熔体系预处理效率的研究  

AlCl_(3) Incorporation Facilitated the Deep Eutectic Solvent Pretreatment

作　　者：程金元 詹云妮 黄晨 邓拥军[1,2] 房桂干[1,2] CHENG Jinyuan;ZHAN Yunni;HUANG Chen;DENG Yongjun;FANG Guigan(Institute of Chemical Industry of Forest Products,CAF,National Engineering Lab.for Biomass Chemical Utilization,Key Lab.of Chemical Engineering of Forest Products,National Forestry and Grassland Administration,Key Lab.of Biomass Energy and Material,Jiangsu Province,Nanjing 210042,China;Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]中国林业科学研究院林产化学工业研究所,生物质化学利用国家工程实验室,国家林业和草原局林产化学工程重点实验室,江苏省生物质能源与材料重点实验室,江苏南京210042 [2]南京林业大学江苏省林业资源高效加工利用协同创新中心,江苏南京210037

出　　处：《林产化学与工业》2022年第2期56-62,共7页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(32001273);江苏省生物质能源与材料重点实验室基本科研业务费项目(JSBEM-S-202004);中国博士后科学基金面上项目(2020M670526)。

摘　　要：研究了一种AlCl_(3)辅助的低共熔溶剂(DES)预处理毛竹的方法。合成了以氯化胆碱和AlCl_(3)为氢受体,愈创木酚为氢供体的低共熔溶剂,考察了低共熔溶剂中AlCl_(3)用量对毛竹原料的化学组成、物料得率和后续酶水解效率的影响,结果表明:随着AlCl_(3)用量的增加,预处理物料木聚糖和木质素含量逐渐降低,葡聚糖含量升高,葡聚糖酶水解得率显著提高。当AlCl_(3)用量为1.32%(摩尔分数),氯化胆碱、愈创木酚和AlCl_(3)物质的量比为25∶50∶1)时,预处理效果达到最佳,预处理物料得率为57.16%,葡聚糖和木聚糖回收率分别为95.95%和12.84%,木质素脱除率为74.88%,葡聚糖酶水解得率由未添加AlCl_(3)时的11.16%提高到96.20%,表明AlCl_(3)可以有效促进DES体系对毛竹中木聚糖和木质素的溶解。通过XRD、SEM和FT-IR分析对预处理后物料进行表征。XRD分析结果表明预处理物料的结晶度随着AlCl_(3)用量的增加逐渐增加,主要是由于木质素和木聚糖组分逐渐被脱除,而纤维素组分无明显破坏;SEM分析结果发现预处理后物料纤维出现碎片化和团聚现象,随着AlCl_(3)用量的增加原料组分被逐渐溶解和破坏;FT-IR分析结果也进一步证明,预处理后的物料中纤维素含量的增加,伴随着木聚糖和木质素含量逐渐减少。The paper presented a method for the pretreatment of bamboo wood with AlCl_(3)assisted eutectic solvent(DES).The DES was synthesized using choline chloride and AlCl_(3)as the hydrogen acceptors,and guaiacol used as the hydrogen donors.The effects of AlCl_(3)dosage in DES on the chemical composition and subsequent enzymatic hydrolysis efficiency of the pretreated bamboo were investigated.The results showed that with the increase of AlCl_(3)dosage,the contents of xylan and lignin decreased gradually with the content of glucan increased in pretreated bamboo,which significantly improved its enzymatic hydrolysis efficiency.Under optimal conditions(the amount of choline chloride,guaiacol and AlCl_(3)was 25∶50∶1).The conversion rate was 42.84%,the recovery of glucan and xylan were 95.95%and 12.84%,respectively,with 74.88%lignin removal.Compared with the DES treatment without the addition of AlCl_(3),glucan enzymatic hydrolysis with AlCl_(3)-assisted DES treatment increased from 11.16%to 96.20%.The results demonstrated that AlCl_(3)could effectively promote the dissolution of xylan and lignin.The pretreated materials were characterized by XRD,SEM,and FT-IR.XRD analysis showed that with the increase of AlCl_(3)dosage,the crystallinity of the pretreated materials increased gradually,mainly due to the gradual removal of lignin and xylan components,while the cellulose components were not significantly damaged.SEM analysis showed that after pretreatment,the pretreated materials appeared obviously fragmentation and agglomeration.With the increase of AlCl_(3)dosage,the bamboo components were gradually dissolved and destroyed.The FT-IR analysis results also proved that the increase of cellulose content in the pretreated materials accompanied by the gradual decrease of xylan and lignin.

关 键 词：AlCl_(3) 低共熔溶剂 毛竹 酶水解 

分 类 号：TQ35[化学工程]