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| Preparation of Phenolic Compounds by Selective Depolymerization of Alkali Lignin from Sinocalamus Oldhami Using Composite Alkali |
| Received:March 22, 2020 |
| DOI：10.11981/j.issn.1000-6842.2021.02.01 |
| Key Words:lignin;composite alkali;hydrothermal degradation;phenolic hydroxyl group;phenolic compound |
| Fund Project:福建省高校产学合作项目（2019H6008）。 |
| Author Name | Affiliation | Postcode | | LIN Xiuhua* | College of Environment and Resources， Fuzhou University， Fuzhou， Fujian Province， 350116 | 350116 | | LIU Minghua | College of Environment and Resources， Fuzhou University， Fuzhou， Fujian Province， 350116
Fujian Provincial Technology Exploitation Base of Biomass Resources， Fuzhou， Fujian Province， 350116 | 350116 | | CHEN Lihui | College of Environment and Resources， Fuzhou University， Fuzhou， Fujian Province， 350116 | 350116 | | LYU Yuancai | College of Environment and Resources， Fuzhou University， Fuzhou， Fujian Province， 350116
Fujian Provincial Technology Exploitation Base of Biomass Resources， Fuzhou， Fujian Province， 350116 | 350116 |
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| Abstract: |
| The production of phenolic compounds during lignin depolymerization using different alkaline catalysts was investigated by choosing Sinocalamus oldhami alkali lignin as raw material. The experimental results showed that the composite alkali systems could effectively depolymerize the lignin under a mild hydrothermal condition， in which the composite alkali system comprising sodium hydroxide and sodium sulfite exhibited the highest efficiency of lignin degradation （83.1±1.2） % and the yield of phenolic compounds （86.85%）. Compared with the control group， the phenolic hydroxyl content increased by approximately 244%. The results of FT-IR， GPC and GC-MS indicated that the synergistic effect of NaOH and Na2SO3 in the composite alkali system could effectively cleave the C—O bonds in lignin， resulting in the selective depolymerization of ligin to produce a series of small molecule compounds with low molecular weight （<1000）， among which the phenolic compounds mainly included phenol， 2-methoxy-phenol， and 4-ethyl-phenol， etc. |
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