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<p>Deep eutectic solvents (DESs) are recognized for their multiple merits, particularly in terms of environmental friendliness, cost-effectiveness, recyclability, and excellent solvent properties, are now widely utilized for biomass pretreatment. The NaOH/ethylene glycol/water-based ternary DES (0.1: 4: 1 molar ratio, N: E: H1), exhibits satisfactory performance in corn stover pretreatment. In order to reduce the solvent cost and promote sustainable development, we have studied the recycling process of N: E: H1. In this study, the effect of the antisolvents type and the recycling times of N: E: H1 on corn stover pretreatment were investigated, and the FTIR, XRD and SEM analysis of corn stover were conducted to reveal pretreatment mechanism. The results showed that methanol containing short carbon chain as antisolvent can be the better candidate than the other two containing long carbon chain, achieving 75.19% of N: E: H1 recovery rate after five cycles. Over five cycles, the lignin removal rates (52.8 ~ 77.5%), hemicellulose removal (36.6 ~ 53.7%), and reducing sugar yields (46.1 ~ 89.1%) demonstrated operational consistency. The FTIR, XRD and SEM analysis results indicate that the recycled N: E: H1 has a certain ability to dissolve both lignin and hemicellulose. The recycling process by using methanol as antisolvent will be promising recycling DES process and promote reducing the cost of DESs pretreatment.</p>

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Study on the recycling of ternary basic deep eutectic solvent pretreated corn Stover

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Ying Zhan,
  • Xuejiao Ma,
  • Chen Liu,
  • Xisheng Hu,
  • Lihua Han,
  • Hongzhou Shang,
  • Xiaoliang Ren,
  • Zheng Zhao

摘要

Deep eutectic solvents (DESs) are recognized for their multiple merits, particularly in terms of environmental friendliness, cost-effectiveness, recyclability, and excellent solvent properties, are now widely utilized for biomass pretreatment. The NaOH/ethylene glycol/water-based ternary DES (0.1: 4: 1 molar ratio, N: E: H1), exhibits satisfactory performance in corn stover pretreatment. In order to reduce the solvent cost and promote sustainable development, we have studied the recycling process of N: E: H1. In this study, the effect of the antisolvents type and the recycling times of N: E: H1 on corn stover pretreatment were investigated, and the FTIR, XRD and SEM analysis of corn stover were conducted to reveal pretreatment mechanism. The results showed that methanol containing short carbon chain as antisolvent can be the better candidate than the other two containing long carbon chain, achieving 75.19% of N: E: H1 recovery rate after five cycles. Over five cycles, the lignin removal rates (52.8 ~ 77.5%), hemicellulose removal (36.6 ~ 53.7%), and reducing sugar yields (46.1 ~ 89.1%) demonstrated operational consistency. The FTIR, XRD and SEM analysis results indicate that the recycled N: E: H1 has a certain ability to dissolve both lignin and hemicellulose. The recycling process by using methanol as antisolvent will be promising recycling DES process and promote reducing the cost of DESs pretreatment.