Size reduction of biomass is an energy-extensive operation for biorefinery, and fundamentals of size effect on biomass fractionation is pressing to be unraveled. Herein, we investigated effect of ground wood particle size on properties of biomass fractionation using p-toluenesulfonic acid (p-TsOH) treatment. Both carbohydrates and lignin dissolution increased with smaller ground wood particle size. Comparatively, delignification performance was much affected by ground wood particle size, and the percentage of lignin dissolution was dramatically enhanced at small ground wood particle size. The excellent delignification selectivity was warranted at small ground wood particle size accordingly. In addition, mechanism of ground wood particle size effect on lignin dissolution was proposed. On one hand, dissolution of lignin by p-TsOH primarily was an aggregation effect, and diffusion of lignin from the microfibril network in biomass became growingly troublesome at large size. On the other hand, depolymerization of lignin mainly occurred in the liquid phase, which essentially led to production of large p-TsOH-lignin aggregates with low diffusivity.

减小生物质的尺寸是生物精炼厂的一种耗能的操作，因此尺寸大小对生物质分馏的影响的基本原理迫在眉睫。在这里，我们研究了木粉粒度对使用对甲苯磺酸（p-TsOH）处理。碳水化合物和木质素的溶出度均随着较小的木屑粒径而增加。相比之下，木屑的粒径会大大影响脱木质素性能，而木屑的粒径较小时，木质素的溶解百分比会大大提高。相应地，在较小的木料粒度下，保证了优异的脱木素选择性。另外，提出了木粉粒度对木质素溶解的影响机理。一方面，木质素被p -TsOH溶解主要是聚集效应，并且木质素从微纤维网络在生物质中的扩散变得越来越麻烦。另一方面，木质素的解聚主要发生在液相中，这实质上导致了大分子产物的产生。对-TsOH-木质素具有低扩散率的聚集体。