Deep eutectic solvent recycling to prepare high purity dissolving pulp

被引:21
|
作者
Chen, Yuanhang [1 ]
Shen, Kuizhong [1 ,2 ,3 ,4 ]
He, Zhibin [5 ]
Wu, Ting [1 ]
Huang, Chen [1 ,2 ]
Liang, Long [1 ]
Fang, Guigan [1 ,2 ,3 ,4 ]
机构
[1] Chinese Acad Forestry, Key Lab Biomass Engn & Mat Jiangsu Prov, Natl Engn Lab Biomass Chem Utilizat,SAF, Key & Open Lab Forest Chem Engn,Inst Chem Ind For, Nanjing 210042, Peoples R China
[2] Nanjing Forestry Univ, Nanjing 210037, Peoples R China
[3] Shandong Huatai Paper Co Ltd, Dongying 257335, Shandong, Peoples R China
[4] CAF, Inst Chem Ind Forestry Prod, Nanjing 210042, Peoples R China
[5] Univ New Brunswick, Fredericton, NB E3B 5A3, Canada
关键词
Lactic acid; choline chloride; Eucalyptus; Dissolving pulp; ENZYMATIC-HYDROLYSIS; LIGNIN; PRETREATMENT; FERMENTATION; GREEN; WOOD; DES;
D O I
10.1007/s10570-021-04188-9
中图分类号
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号
0805 ; 080502 ; 0822 ;
摘要
In this work, a novel acid-based deep eutectic solvent (DES) recycling process was developed for the pretreatment of eucalyptus wood chips in the preparation of high purity dissolving pulp. It was found that a large amount of lignin and xylan in the eucalyptus wood material were extracted in the recycling treatment with lactic acid/choline chloride. The dissolved lignin and xylan in DES were recovered by precipitation in water, and the DES solvent was regenerated by removing the water through evaporation. The residual lignin and xylan in the DES pre-treated wood chips were more readily removed in the subsequent kraft cooking and bleaching processes, yielding a high-purity dissolving pulp (DES-KP). Compared with the conventional prehydrolysis kraft based dissolving pulp (PHK), the DES-KP had a higher alpha-cellulose (94.02% vs. 89.81%) and a markedly higher Fock reactivity (98.94% vs. 60.97%). In addition, the DES pretreatment was also combined with oxygen-alkali cooking and ECF bleaching process, to prepare a dissolving pulp (DES-BP) with a high pulping yield (44.40%). The DES-KP pulping process was advantageous compared with the conventional PHK process in terms of the biorefinery concept, as the total utilization rate of the biomass of the eucalyptus wood chips reached 69.74%. Therefore, the DES pretreatment is a promising process for efficient biomass utilization in dissolving pulp production.
引用
收藏
页码:11503 / 11517
页数:15
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