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| Study on Depolymerization of Lignin in Solvent System and Properties of the Oligomer Obtained |
| Received:December 09, 2021 |
| DOI：10.11981/j.issn.1000-6842.2022.02.01 |
| Key Words:lignin;solvent depolymerization;liquid phase product;oligomer |
| Fund Project:广州市科技计划项目（No.202002030157）；山东省重点研发计划项目（No.2019JZZY010501）。 |
| Author Name | Affiliation | Postcode | | YU Qiumei* | State Key Laboratory of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Experimental Teaching Demonstration Center of Light Industry and Food Science， South China University of Technology， Guangzhou， Guangdong Province， 510640 | 510640 | | WU Shubin | State Key Laboratory of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Experimental Teaching Demonstration Center of Light Industry and Food Science， South China University of Technology， Guangzhou， Guangdong Province， 510640 | 510640 |
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| Abstract: |
| Eucalyptus lignin was depolymerized using isopropanol/water as solvent， Ni-Ru/Hβ as catalyst and effects of isopropanol/water volume ratio， reaction temperature， and reaction time on the liquid product conversion rate and monophenol yield of lignin depolymerization were investigated. The liquid products were further separated by solvent sequential extraction to obtain oligomer-rich components， which were characterized by using GC-MS， ESI+-HRMS， GPC， etc.， to explore their contents and structures. The results showed that the product yields of liquid phase and solid phase were 81.0% and 11.3%， respectively， when eucalyptus lignin was treated in the isopropanol/water mixed solvent system with volume ratio of 3∶1 at 300℃ for 4 h， with yield of monophenol in the liquid phase product of 13.7%. It was noted that the two oligomer-rich components obtained from the liquid phase products accounted for 22.6% of their mass. |
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