Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, National Engineering Lab. for Biomass Chemical Utilization, Jiangsu Province Key Laboratory of Biomass Energy and Materials, Nanjing, Jiangsu 210042, China; Jiangsu Co-Innovation Centre of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, Jiangsu 210037, China.
Jiangsu Co-Innovation Centre of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-forest Biomass, Nanjing Forestry University, Nanjing, Jiangsu 210042, China; College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China.
Bioresour Technol. 2021 Feb;321:124440. doi: 10.1016/j.biortech.2020.124440. Epub 2020 Nov 23.
This work exploits a one-pot method for directional depolymerizing organosolv lignin into high added-value phenolic monomers with synergistic reaction system consisted of methanol-dimethoxymethane binary solvents and acid catalyst. The influence of solvent composition and reaction parameters such as different catalyst, binary solvents ratio, time, and temperature on the conversion of lignin and yield of products were investigated carefully, the optimum yield of liquid products and phenolic monomers were achieved at 67.39% and 27.67% at 200 °C kept for 60 min with low amount of acid catalyst. The plausible mechanism on the depolymerization of lignin was proposed in view of product distributions. Moreover, the combination of co-solvents and acidic catalyst was also suitable for converting different types of lignin into phenolic monomers, and the recyclability of joint reaction system was satisfactory. These results can provide promising prospects on developing an effective method for achieving high added-value phenolic compounds from lignin.
本工作利用一锅法，在甲醇-二甲氧基甲烷二元溶剂和酸催化剂协同反应体系中，将有机溶木质素定向解聚为高附加值酚类单体。详细考察了溶剂组成和反应参数（如不同催化剂、二元溶剂比、时间和温度）对木质素转化率和产物收率的影响，在低酸催化剂用量下，在 200°C 保持 60min 时，液体产物和酚类单体的最佳收率分别达到 67.39%和 27.67%。根据产物分布，提出了木质素解聚的可能机理。此外，共溶剂和酸性催化剂的组合也适用于将不同类型的木质素转化为酚类单体，并且联合反应体系的可回收性令人满意。这些结果为从木质素中获得高附加值酚类化合物提供了有前景的方法。
