Abstract: Lignocellulosic biomass is a green and degradable carbon neutral resource that contains components such as cellulose to provide sustainable raw materials for the production of biofuels and chemicals. Ramie bone is a cellulose-rich agricultural waste mainly composed of cellulose, lignin and hemicellulose. Cellulose, hemicellulose and lignin are physically and chemically cross-linked and entangled with each other to form a dense supramolecular complex structure that resists damage from the outside world. The complex structure of biomass dictates that it needs to be treated to break the barrier of biomass against depolymerization and to achieve separation of cellulose and other components. The p-toluenesulfonic acid is an acid hydrotropes solvent that forms a colloid with lignin at its hydrophobic end to dissolve lignin, and dissociates hydrogen ions from the hydrophilic end to attack hemicellulose, leaving the cellulose as a solid residue. However, previous studies have tended to focus on the extraction and characterization of lignin using p-toluenesulfonic acid, with less attention being paid to the solid fraction of cellulose. In this study, we used p-toluenesulfonic acid combined with hydrogen peroxide in a one-step treatment of ramie bone to investigate the effects of p-toluenesulfonic acid concentration, hydrogen peroxide concentration, temperature and time on the degumming effect. The results showed that 95.90% of the lignin in ramie bone was dissolved and the cellulose content increased to 80.79% with 75% mass concentration of p-toluenesulfonic acid and 3% volume fraction of H2O2 at 75°C for 80 min, which was 37.61% higher than the original sample. Due to the removal of non-fibrous components, the thermal stability of ramie bone was improved and the surface changed from smooth to rough. Meanwhile, the results of infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis indicated that the combination of p-toluenesulfonic acid and hydrogen peroxide disrupted the structure of ramie bone and promoted the dissolution of lignin. This provides a simple and effective way for the utilization of ramie bone.

Key words: ramie bone, p-toluenesulfonic acid, cellulose, degumming

摘要： 为了深入利用苎麻骨，采用对甲苯磺酸联合过氧化氢一步法处理苎麻骨，考察对甲苯磺酸质量浓度、过氧化氢体积分数、温度和时间对脱胶效果的影响。结果表明：75%质量浓度的对甲苯磺酸、3.0%体积分数的H2O2在75 ℃下联合处理苎麻骨80 min时，苎麻骨中95.90%的木质素被溶解，纤维素含量提高到80.79%，较原样增加了37.61%。红外光谱、扫描电镜、热重分析结果表明：对甲苯磺酸与过氧化氢联合破坏了苎麻骨的结构，促进了木质素的溶解，最终获得的苎麻骨纤维素纯度高、可及性增强，起始分解温度提高。研究结果为苎麻骨的利用提供了一条简单、有效的途径。

关键词: 苎麻骨, 对甲苯磺酸, 纤维素, 脱胶