Co-Production of High-Grade Dissolving Pulp,Furfural,and Lignin from Eucalyptus via Extremely Low Acid Pretreatment and Pulping Technologies and Catalysis

作     者：Chengxiang Li Yue Wu Chunhui Zhang Yao Liu Qixuan Lin Junli Ren 

作者机构：State Key Laboratory of Pulp and Paper EngineeringSchool of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510640China 

出 版 物：《Journal of Renewable Materials》 (可再生材料杂志（英文）)

年 卷 期：2023年第11卷第6期

页      面：2555-2574页

核心收录：

学科分类：082903[工学-林产化学加工工程] 08[工学] 0829[工学-林业工程] 082201[工学-制浆造纸工程] 0822[工学-轻工技术与工程] 

基　　金：This research was funded by the National Natural Science Foundation of China(No.21978104) the Program for the National Key Research and Development Program of China(No.2021YFC2101601) 

主　　题：Eucalyptus extremely low acid pretreatment dissolving pulp furfural kraft lignin 

摘      要：Hemicellulose and lignin are not reasonably utilized during the dissolved pulp preparation *** work aimed to propose a process for the co-production of dissolving pulp,furfural,and lignin from ***-grade dissolving pulp was prepared from eucalyptus using a combination of extremely low acid(ELA)pretreatment,Kraft cooking,and elementary chlorine-free(ECF)*** obtained pre-hydrolysate was catalytic conversion into furfural in a biphasic system,and lignin during Kraft cooking and ECF was *** process condition was discussed as well as the mass flow *** results showed that ELA pretreatment could effectively remove 80.1%*** with traditional hydrothermal pretreatment,the ELA pretreatment significantly increased the xylose yield from 5.05 to 14.18 g/L at 170℃ for 2 h,which had practical significance for furfural *** 82.7%furfural yield and 82.9%furfural selectivity were obtained from xylose-rich pre-hydrolysate using NaCl as a phase modifier in a biphasic system with 4-methyl-2-pentanone(MIBK)as an organic phase by ion exchange resin catalysts at 190℃ for 2 ***,the pretreated eucalyptus was subjected to Kraft cooking,and the optimal alkali amount was 14%.Then,the Kraft pulp was bleached using the O-D1-EP-D_(2) sequence,and dissolving pulp was obtained with an ISO brightness of 86.0%,viscosity of 463 mL/g,andα-cellulose content of 95.4%.The Kraft lignin which has a potential application was investigated by 2D-HSQC NMR and 31P *** results showed that the S/G ratio of Kraft lignin was 1.93,and the content of phenolic hydroxyl groups was 2.53 mmol/***,based on the above proposed process,30.5 g dissolving pulp,5.5 g furfural,and 21.2 g lignin per 100 g eucalyptus chips(oven dry)were *** research will provide new catalysis and pulping technical routes for dissolving pulp,furfural,and Kraft lignin products,which are in great demand in the chemical industry.