固体酸耦合熔融盐体系催化细小纤维水解制备葡萄糖  

Selectively catalytic hydrolysis of fine fiber to produce glucose by solid acid catalyst in a molten salt system

作　　者：尹杰 王兴杰 刘遥 朱若楠 任俊莉 Jie Yin;Xingjie Wang;Yao Liu;Ruonan Zhu;Junli Ren(State Key Laboratory of Pulp and Paper Engineering,School of Light Industry Science and Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学轻工科学与工程学院、制浆造纸工程国家重点实验室,广州510640

出　　处：《中国科学:化学》2025年第1期277-286,共10页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:22178135);中国博士后科学基金(编号:2023TQ0121);国家资助博士后研究人员计划C档项目(编号:GZC20230843)资助。

摘　　要：葡萄糖作为重要的化工原料,可以从纤维素水解获得.近年来,固体酸催化剂因具有良好的循环性能、易分离、低腐蚀性等特点被应用于聚合度(degreeofpolymerization,DP)低的微晶纤维素水解制备葡萄糖,并展现出良好的水解性能.然而,天然纤维素DP较高,因固-固反应使得传质传热受限,导致天然纤维素水解效率较低.本研究借助熔融盐水合物如LiBr·3H_(2)O对纤维素良好的溶解性,通过固体酸催化协同,实现天然纤维素的高效水解,对比研究了不同固体酸催化剂的理化特性,探究了固体酸催化剂协同LiBr·3H_(2)O熔融盐体系对造纸副产物细小纤维(DP=961)催化水解效果的影响,并优化了最佳反应条件.结果表明:HZSM-5固体酸催化剂结合LiBr·3H_(2)O熔融盐体系展现出了优异的细小纤维素催化水解性能,可以获得较高的葡萄糖得率,在129℃下进行催化水解反应243min,葡萄糖得率高达70.43%.该研究为天然纤维素水解高效制备葡萄糖提供了新途径.Glucose,a vital chemical feedstock,can be produced through the catalytic hydrolysis of renewable cellulose.Most recently,researchers have identified solid acid catalysts as promising candidates for the hydrolysis of low degree of polymerization(DP)microcrystalline cellulose to glucose because solid acid catalysts are favored for the great recyclability,ease separation,and low corrosiveness.However,it is difficult for the hydrolysis of high DP cellulose due to the solid-solid reactions,resulting in low hydrolysis efficiency of cellulose.In view of the good solubility of cellulose in molten salt hydrates such as LiBr·3H_(2)O,this work investigated the hydrolysis of fine fibers(DP=961)catalyzed by solid catalysts coupled with the molten salt hydrates.The physicochemical characteristics of different solid acid catalysts were compared,and the synergistic effects of solid acid catalysts combined with a LiBr∙3H_(2)O molten salt system was explored for the hydrolysis of fine fibers.The results show that the HZSM-5 solid acid coupled with LiBr·3H_(2)O molten salt system exhibits excellent catalytic performance,achieving a high glucose yield,where a glucose yield of 70.43% was obtained at 129℃ after 243 min of hydrolysis.This research provides a new route for the efficient preparation of glucose from the hydrolysis of natural cellulose.

关 键 词：细小纤维 固体酸 熔融盐水合物 水解 葡萄糖 

分 类 号：TQ3[化学工程]