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<p>Aiming towards fully valorizing biomass, this study proposed an integrated process for eucalyptus to produce dissolving pulp, furfural and reactive lignin by using spiral extrusion with sequential p-toluenesulfonic acid (p-TsOH) pretreatment. Under optimal conditions (70&#xa0;wt% p-TsOH, 80&#xa0;°C, 50&#xa0;min), 80.0% and 79.5% of lignin and hemicellulose were removed, respectively, while 92.2% of cellulose was retained in solid residue. After further cooking and bleaching processes, the dissolving pulp with 96.1% of α-cellulose content was obtained. Moreover, 75.6% of furfural yield was reached from the hydrolysate without additional catalysts for 170&#xa0;°C at 50&#xa0;min. The dissolved lignin showed low β-O-4 content and molecular weight with high phenolic OH content, which was suitable for lignin-based materials. This study provides a sequential valorization strategy for eucalyptus to produce dissolving pulp, furfural and reactive lignin, which would achieve the separation and directed transformation of all components of eucalyptus wood.</p>

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Promising sequential valorization strategy for eucalyptus to produce dissolving pulp, furfural and lignin

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Yue Wu,
  • Chengxiang Li,
  • Ruonan Zhu,
  • Xingjie Wang,
  • Junli Ren

摘要

Aiming towards fully valorizing biomass, this study proposed an integrated process for eucalyptus to produce dissolving pulp, furfural and reactive lignin by using spiral extrusion with sequential p-toluenesulfonic acid (p-TsOH) pretreatment. Under optimal conditions (70 wt% p-TsOH, 80 °C, 50 min), 80.0% and 79.5% of lignin and hemicellulose were removed, respectively, while 92.2% of cellulose was retained in solid residue. After further cooking and bleaching processes, the dissolving pulp with 96.1% of α-cellulose content was obtained. Moreover, 75.6% of furfural yield was reached from the hydrolysate without additional catalysts for 170 °C at 50 min. The dissolved lignin showed low β-O-4 content and molecular weight with high phenolic OH content, which was suitable for lignin-based materials. This study provides a sequential valorization strategy for eucalyptus to produce dissolving pulp, furfural and reactive lignin, which would achieve the separation and directed transformation of all components of eucalyptus wood.