Selective conversion of lignin in corncob residue to monophenols with high yield and selectivity
文献情報
Zhicheng Jiang, Ting He, Jianmei Li, Changwei Hu
The conversion of lignin to monophenols is regarded as a promising approach to produce high-quality biofuel from renewable feedstocks, because of the higher H/Ceff of lignin than that of cellulose and hemicellulose. In this work, the selective conversion of lignin in corncob residue to monophenols was achieved via a two-step process without significant degradation of cellulose. In the first step, the lignin component in corncob residue was selectively degraded to oligomers in the H2O–tetrahydrofuran (THF) (3 : 7, v/v) co-solvent system, and the percentage of delignification reached up to 89.8%. Further reaction of the filtrate in the THF solvent led to further depolymerization of oligomers to monophenols, and the yield of total monophenols reached up to 24.3 wt% without hydrogen addition under the optimized conditions. 4-Ethylphenol (10.5 wt%), 2,6-dimethoxyphenol (6.6 wt%), and 4-ethylguaiacol (4.0 wt%) were the predominant products, which occupied 86.8% of the identified monophenols. This approach achieved high yield and selectivity to monophenols directly from corncob residue, simplifying the separation process. The obtained reaction residue with high content of cellulose (83.5%) is possibly a preferable feedstock to produce biofuel such as ethanol by fermentation.
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