Abstract
Hydrothermal process is a potential technology to convert lignocellulosic resources into biofuels and value-added chemicals in a green fashion. Fractionation of woody biomass allows the exploration of the concept of integrated forestry biorefinery. The hydrolysis of hemicellulose produces oligosaccharides, pentose (xylose and arabinose), hexose (glucose, mannose, and galactose), acids (acetic acid, formic acid, and levulinic acid), and furans (furfural and 5-hydroxymethylfurfural), as well as resulting insoluble humins as by-products under harsh conditions. This chapter highlights recent results on hydrothermal processing of various lignocellulosic biomasses, including fundamentals of hydrothermal pretreatment and mechanistic and kinetic studies in such process, especially in analysis and characterization of hemicelluloses before and after hydrothermal processing.
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Abbreviations
- Ac:
-
Acetyl
- AcOS:
-
Acetyl groups bonded to oligosaccharides
- AG:
-
Arabinogalactan
- AGX:
-
Arabinoglucuronoxylan
- Ara:
-
Arabinose
- ArOS:
-
Arabinooligosaccharides
- ATR-FTIR:
-
Attenuated total reflectance Fourier transform infrared spectroscopy
- AX:
-
Arabinoxylan
- DP:
-
Degree of polymerization
- FF:
-
Furfural
- FT-IR:
-
Fourier transform infrared spectroscopy
- Gal:
-
Galactose
- GaOS:
-
Galactooligosaccharides
- GGMs:
-
Galactoglucomannans
- Glcp :
-
Glucopyranosyl
- GluA:
-
Glucuronic acid
- GluOS:
-
Glucooligosaccharides
- GM:
-
Glucomannan
- GPC:
-
Gel permeation chromatography
- GX:
-
Glucuronoxylan
- HMF:
-
5-Hydroxymethylfurfural
- HPAEC:
-
High-performance anion-exchange chromatography
- HPLC:
-
High-performance liquid chromatography
- HPSEC:
-
High-performance size-exclusion chromatography
- HSQC:
-
Heteronuclear single-quantum correlation
- LA:
-
Levulinic acid
- LCC:
-
Lignin–carbohydrate complex
- LCMs:
-
Lignocellulosic materials
- LHW:
-
Liquid hot water
- Man:
-
Mannose
- Manp :
-
Mannopyranosyl
- MALDI-TOF MS:
-
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry
- MLG:
-
β-(1→3, 1→4)-glucans
- M W :
-
Weight-average molecular weight
- NMR:
-
Nuclear magnetic resonance spectroscopy
- OS:
-
Oligosaccharides
- PAD:
-
Pulsed amperometric detector
- RID:
-
Refractive index detector
- SEC:
-
Size-exclusion chromatography
- SEM:
-
Scanning electron microscope
- TOS:
-
Total oligosaccharides
- X:
-
Homoxylan
- XG:
-
Xyloglucan
- XOS:
-
Xylooligosaccharides
- Xyl:
-
Xylose
- Xylp :
-
Xylopyranosyl
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 21506013), State Key Laboratory of Pulp and Paper Engineering (No. 201518), Open Funding Project of Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals (No. JSBGFC14009), Fundamental Research Funds for the Central Universities (No. BLYJ2014-38), and China Postdoctoral Science Foundation (No. 2015M570040).
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Xiao, LP., Song, GY., Sun, RC. (2017). Effect of Hydrothermal Processing on Hemicellulose Structure. In: Ruiz, H., Hedegaard Thomsen, M., Trajano, H. (eds) Hydrothermal Processing in Biorefineries. Springer, Cham. https://doi.org/10.1007/978-3-319-56457-9_3
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