Scholarlink

<p>To investigate the mechanism of N-methylmorpholine-N-oxide (NMMO) swelling-twin-screw extrusion treatment on cellulose microfiber separation from rice straw in complex multi-component systems, rice straw samples with varying hemicellulose and lignin contents were prepared using acid detergent and acidified sodium chlorite pretreatments. The effects of NMMO swelling-twin-screw extrusion treatment on microstructure, chemical composition, and extrusion energy consumption were systematically evaluated. Results showed that after NMMO treatment, the solid yield of hemicellulose in the raw sample significantly decreased (&gt; 10%), while cellulose and lignin contents exhibited insignificant changes (&lt; 5%). Following NMMO swelling-extrusion treatment, the average particle size reduction ranged from 23.23 to 30.04% for partially de-hemicellulosed samples and from 17.84 to 36.61% for delignified samples. The de-hemicellulose group displayed more surface-roughened, irregular lignin blocks and fewer fragmented cellulose microfibers, whereas the delignified group exhibited more microfibers with higher aspect ratios. Extrusion treatment reduced the crystallinity of NMMO-swollen de-hemicellulose samples but increased that of delignified samples. Lignin removal was more favorable for the disruption of interchain hydrogen bonds (O6H…O3') during NMMO swelling–extrusion. Additionally, NMMO swelling significantly reduced extrusion energy consumption for all samples, with lignin removal further decreasing energy consumption by 15%. By regulating the removal extent of hemicellulose and lignin, this study systematically elucidates the mechanism of NMMO swelling-extrusion treatment on microfiber separation behavior, providing important theoretical foundations and technical support for efficient straw resource separation.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of NMMO swelling-extrusion treatment on rice straw microfiber separation under different component conditions

  • 期刊论文

  • 发表日期：

    2026年3月16日

查看全文
  • Wenke Ai,
  • Chongfeng Gao,
  • Ping Jiang,
  • Songlin Sun,
  • Chaoran Sun

摘要

To investigate the mechanism of N-methylmorpholine-N-oxide (NMMO) swelling-twin-screw extrusion treatment on cellulose microfiber separation from rice straw in complex multi-component systems, rice straw samples with varying hemicellulose and lignin contents were prepared using acid detergent and acidified sodium chlorite pretreatments. The effects of NMMO swelling-twin-screw extrusion treatment on microstructure, chemical composition, and extrusion energy consumption were systematically evaluated. Results showed that after NMMO treatment, the solid yield of hemicellulose in the raw sample significantly decreased (> 10%), while cellulose and lignin contents exhibited insignificant changes (< 5%). Following NMMO swelling-extrusion treatment, the average particle size reduction ranged from 23.23 to 30.04% for partially de-hemicellulosed samples and from 17.84 to 36.61% for delignified samples. The de-hemicellulose group displayed more surface-roughened, irregular lignin blocks and fewer fragmented cellulose microfibers, whereas the delignified group exhibited more microfibers with higher aspect ratios. Extrusion treatment reduced the crystallinity of NMMO-swollen de-hemicellulose samples but increased that of delignified samples. Lignin removal was more favorable for the disruption of interchain hydrogen bonds (O6H…O3') during NMMO swelling–extrusion. Additionally, NMMO swelling significantly reduced extrusion energy consumption for all samples, with lignin removal further decreasing energy consumption by 15%. By regulating the removal extent of hemicellulose and lignin, this study systematically elucidates the mechanism of NMMO swelling-extrusion treatment on microfiber separation behavior, providing important theoretical foundations and technical support for efficient straw resource separation.

Graphical abstract