Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, School of Light Industrial and Food Engineering, Guangxi University, Nanning 530004, China.
Int J Mol Sci. 2022 Aug 6;23(15):8743. doi: 10.3390/ijms23158743.
As a green and efficient component separation technology, organic acid pretreatment has been widely studied in biomass refining. In particular, the efficient separation of lignin by -toluenesulfonic acid (-TsOH) pretreatment has been achieved. In this study, the mechanism of the atmospheric separation of bagasse lignin with -TsOH was investigated. The separation kinetics of lignin was analyzed. A non-simple linear relationship was found between the separation yield of lignin and the concentration of -TsOH, the temperature and the stirring speed. The shrinking nucleus model for the separation of lignin was established based on the introduction of mass transfer and diffusion factors. A general model of the total delignification rate was obtained. The results showed that the process of lignin separation occurred into two phases, i.e., a fast stage and a slow stage. The results provide a theoretical basis for the efficient separation of lignin by -TsOH pretreatment.
作为一种绿色高效的组分分离技术，有机酸预处理在生物质精炼中得到了广泛的研究。特别是通过对甲苯磺酸（-TsOH）预处理实现了木质素的高效分离。本研究探讨了 -TsOH 常压分离甘蔗渣木质素的机制，分析了木质素的分离动力学。发现木质素的分离产率与 -TsOH 的浓度、温度和搅拌速度之间并非简单的线性关系。基于引入传质和扩散因素，建立了木质素分离的收缩核模型。得到了总脱木质素速率的通用模型。结果表明，木质素的分离过程分为两个阶段，即快速阶段和缓慢阶段。该结果为 -TsOH 预处理高效分离木质素提供了理论依据。
