Abstract
Efficient component separation technology is one of the key ways to improve the efficiency of lignocellulose bioconversion. In this study, the formic acid method was used to separate the components of lignocellulose from Miscanthus lutarioriparius, hemicellulose was degraded into xylose simultaneously, and the composition and structure of the separated components were analyzed. Then, xylose was further purified with activated carbon for decolorization and resins for the removal of formic acid and other monosaccharide impurities. The results showed that formic acid could effectively separate the cellulose, hemicellulose, and lignin of lignocellulose with recoveries of 91.7%, 80.2%, and 85.3%, respectively. Structural analyses revealed that the cellulose and lignin underwent different degrees of formylation during the formic acid treatment, yet their primary structures remained intact, and the crystallinity of cellulose increased significantly. By GC–MS and HPLC analysis, xylose was the main component of hemicellulose extract, accounting for 74.90%. The activated carbon treatment decolorized the xylose extract more than 93.66% and gave a xylose recovery of 88.58%. D301 resin could effectively remove more than 99% of the formic acid residue in xylose. The xylose extract was further purified by removing arabinose and other monosaccharide impurities with Dowex 50wx4 resin, which increased the purity to 95%. The results demonstrated that the formic acid method is an effective method to separate lignocellulose and prepare xylose, and it has broad application prospects in the field of bio-refining lignocellulose resources such as Miscanthus lutarioriparius
Highlights
Lignocellulose is the most abundant renewable organic resource on earth, but it is not fully utilized
The recoveries of cellulose, hemicellulose, and lignin obtained by formic acid were 91.7%, 80.2%, and 85.3%, respectively
The material balance calculation showed that the three components obtained after formic acid treatment were more than 87% compared to the original content in the Miscanthus lutarioriparius (ML) straw
Summary
Lignocellulose is the most abundant renewable organic resource on earth, but it is not fully utilized. It can be degraded and converted into liquid fuels, bio-based materials, and various platform compounds by biorefinery for energy saving, consumption reduction, and emission reduction, which is considered an important strategic approach to solve urgent problems in resources, environment, rural development, and population health for sustainable development [1]. Lignocellulose is mainly composed of cellulose (30~45%), hemicellulose (20~25%), and lignin (15~25%). In order to realize the conversion of lignocellulosic resources to biomass energy, the separation of cellulose and hemicellulose from lignocellulose by efficient technology is key to improve the bioconversion efficiency
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