Sawdust is an abundant high-quality residue from sawmills, representing 20–30 % of sawn products by volume. In this study, the chemical pre-treatment of pine sawdust with Fenton’s reagent, formed from hydrogen peroxide and iron catalyst under moderately acidic conditions, was found to intensify the microfibrillation process in terms of energy consumption and improve the grade of the high-yield lignin-containing microfibrillated cellulose (LMFC) produced.

With a minor yield loss of 5.5 wt.%, Fenton pre-treatment increased the microfibrillation rate and bonding potential of LMFC, indicating that the ultrastructure of the lignocellulose cell walls had been modified. Linear dependency between the growth of specific surface area and energy consumption was seen, i.e. microfibrillation followed Rittinger’s law of comminution. In comparison with the reference without any pretreatment,the total grinding energy consumption to a particle size of 14 µm was about 30 % lower (10.7 vs. 15 MWh/t) while the tensile strength and stiffness of LMFC films were 50 % (100 vs. 66 MPa) and 35 % higher (6.6 vs. 4.9 GPa), respectively. The advantageous effects of Fenton chemistry were assumed to originate from the cleavage of lignin-carbohydrate bonds, mainly between lignin and hemicelluloses. This phenomenon was supported by the substantially increased solubility of polysaccharides in dilute alkali.

The calculated manufacturing costs of LMFCs (using the above-mentioned specifications) was € 850/t, of which the raw material, chemical and electricity costs accounted for 10 %, 2 % and 88 %, respectively. Without any chemical pre-treatment, manufacturing costs were € 1100/t of which raw material accounted for 7 % and electricity 93 %.

锯末是来自锯木厂的大量优质残渣，按体积计算占锯材产品的 20-30%。在这项研究中，发现在中等酸性条件下，用过氧化氢和铁催化剂形成的芬顿试剂对松木屑进行化学预处理，可以在能耗方面强化微纤化过程，并提高高产木质素的品位。 - 生产含微纤化纤维素 (LMFC)。

Fenton 预处理增加了 5.5 wt.% 的轻微产率损失，提高了 LMFC 的微纤化率和键合潜力，表明木质纤维素细胞壁的超微结构已被改变。可以看到比表面积的增长和能量消耗之间的线性相关性，即微纤化遵循里廷格的粉碎定律。与未经任何预处理的参考相比，14 µm 粒径的总研磨能耗降低约 30%（10.7 vs. 15 MWh/t），而 LMFC 薄膜的拉伸强度和刚度为 50%（100 vs. . 66 MPa) 和 35 % (6.6 vs. 4.9 GPa)，分别。Fenton 化学的有利影响被认为源于木质素-碳水化合物键的断裂，主要是木质素和半纤维素之间的键。

LMFC 的计算制造成本（使用上述规格）为 850 欧元/吨，其中原材料、化学品和电力成本分别占 10%、2% 和 88%。如果没有任何化学预处理，制造成本为 1100 欧元/吨，其中原材料占 7%，电力占 93%。