Low-condensed lignin and high-purity cellulose production from poplar by synergistic deep eutectic solvent-hydrogenolysis pretreatment

Shuangmei Han; Ruizhen Wang; Kui Wang; Jianchun Jiang; Junming Xu

doi:10.1016/j.biortech.2022.127905

Low-condensed lignin and high-purity cellulose production from poplar by synergistic deep eutectic solvent-hydrogenolysis pretreatment

Bioresour Technol. 2022 Nov:363:127905. doi: 10.1016/j.biortech.2022.127905. Epub 2022 Sep 7.

Authors

Shuangmei Han¹, Ruizhen Wang¹, Kui Wang², Jianchun Jiang², Junming Xu³

Affiliations

¹ Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province, National Engineering Lab. for Biomass Chemical Utilization, Nanjing 210042, China.
² Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province, National Engineering Lab. for Biomass Chemical Utilization, Nanjing 210042, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
³ Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province, National Engineering Lab. for Biomass Chemical Utilization, Nanjing 210042, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China. Electronic address: xujunming@icifp.cn.

PMID: 36087647
DOI: 10.1016/j.biortech.2022.127905

Abstract

This paper presented a green and environmentally friendly method to obtain lignin with a structure similar to milled wood lignin (MWL) and high-purity cellulose from biomass in a two-step process. The first step, maleic acid (MA), choline chloride (ChCl), and ethylene glycol (EG) ternary deep eutectic solvent (DES) pretreatment was performed to obtain lignin with less-condensed structure. The results showed that the obtained lignin had similar properties to MWL under the condition (MA/ChCl/EG = 1:5:15, 80°C, 10 h). The DES recovered still had good cycle performance. The second step, the cellulose-rich residue was hydrogenated with isopropanol-water solvent and Raney nickel to obtain high-purity cellulose. The results showed that the purity of cellulose obtained by catalytic hydrogenolysis was > 94%. The glucose yield after enzymatic hydrolysis was 243.72 mg/g, which was 14.7 times higher than the untreated poplar. Overall, this work was of great significance for the effective separation of biomass.

Keywords: Catalytic hydrogenolysis; High-purity cellulose; Less-condensed structure; Lignin; Ternary DES.

MeSH terms

2-Propanol
Biomass
Cellulose*
Choline / chemistry
Deep Eutectic Solvents
Ethylene Glycols
Glucose / chemistry
Hydrolysis
Lignin* / chemistry
Nickel
Solvents / chemistry
Water

Substances

Deep Eutectic Solvents
Ethylene Glycols
Solvents
Water
Nickel
Cellulose
Lignin
Glucose
Choline
2-Propanol