Depolymerization of Rice Straw Lignin into Value-Added Chemicals in Sub-Supercritical Ethanol

Depolymerization of lignin is an important step to obtain a lignin monomer for the synthesis of functional chemicals. In the context of more lignin produced from biomass and pulp industry, converting real lignin with low purity is still required more studies. In this study, the influence of solvent...

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Published inTheScientificWorld Vol. 2022; pp. 7872307 - 10
Main Authors Tran, Viet T, Le, Tan M., Vu, Phu V., Nguyen, Hien M., Duong, Yen H.P, Le, Phung K.
Format Journal Article
LanguageEnglish
Published United States Hindawi 2022
John Wiley & Sons, Inc
Hindawi Limited
Subjects
Acetaldehyde
Alcohol
Alcohol, Denatured
Biodiesel fuels
Biofuels
Biomass
Carbon
Cellulose
Depolymerization
Ethanol
Fourier transforms
Gas chromatography
Infrared analysis
Lignin
Lignocellulose
Mass spectroscopy
Organic chemicals
Payback periods
Phenolic compounds
Phenols
Pulp & paper industry
Raw materials
Rice
Rice straw
Solvents
Straw
Wood preservatives
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Summary:Depolymerization of lignin is an important step to obtain a lignin monomer for the synthesis of functional chemicals. In the context of more lignin produced from biomass and pulp industry, converting real lignin with low purity is still required more studies. In this study, the influence of solvent composition and reaction parameters such as binary solvents ratio, time, and temperature, the solvent-to-lignin ratio on the depolymerization of rice straw lignin was investigated carefully. Essential lignin-degraded products including liquid product (LP), char (solid), and gas were obtained, and their yields were directly influenced by reaction conditions. Results show that the maximum lignin conversion rate of 92% and LP yield of 66% was under the condition of 275°C, 30 min, 75 : 1 (mL solvent/1 g lignin), and ethanol 50%. Gas chromatography-mass spectroscopy (GC-MS) analysis was used for the analysis of the depolymerization products and identified 11 compounds which are mainly phenolic compounds such as 2-ethylphenol, 3-ethylphenol, phenol, methyl 2,4,6-trimethylbenzoate. The structure changes of LP and char in various conditions were analyzed using Fourier-transform infrared (FTIR).
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Academic Editor: Ghadir A. El-Chaghaby
ISSN:2356-6140
1537-744X
1537-744X
DOI:10.1155/2022/7872307