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Abstract <p>A new approach to fractionating coconut fiber by the hydrothermal method using ethanol and supercritical (SC) CO<sub>2</sub> as cosolvents has been proposed. The efficiency of the method for extracting valuable components due to the synergistic effect of hydrothermal treatment and enhanced solubility of biomass in the ethanol–water–SC-CO<sub>2</sub> system has been shown. A 15-min treatment at a temperature of 110°C, a pressure of 12 MPa, and a fiber-to-ethanol weight ratio of 1 : 20 has led to a maximum lignin yield of 65%, which is more than 2 times higher than the yield in the case of hydrothermal extraction with the addition of ethanol (26%). Using IR and NMR spectroscopy, it has been shown that carbonyl groups and the native ratio between G (guaiacyl) and S (syringyl) structural units are preserved in the extracted lignin in accordance with the published data.</p>

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Hydrothermal Extraction of Coconut Fiber Components in the Presence of Ethanol and Supercritical Carbon Dioxide

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • N. V. Duy,
  • P. Yu. Tsygankov,
  • N. V. Menshutina

摘要

Abstract

A new approach to fractionating coconut fiber by the hydrothermal method using ethanol and supercritical (SC) CO2 as cosolvents has been proposed. The efficiency of the method for extracting valuable components due to the synergistic effect of hydrothermal treatment and enhanced solubility of biomass in the ethanol–water–SC-CO2 system has been shown. A 15-min treatment at a temperature of 110°C, a pressure of 12 MPa, and a fiber-to-ethanol weight ratio of 1 : 20 has led to a maximum lignin yield of 65%, which is more than 2 times higher than the yield in the case of hydrothermal extraction with the addition of ethanol (26%). Using IR and NMR spectroscopy, it has been shown that carbonyl groups and the native ratio between G (guaiacyl) and S (syringyl) structural units are preserved in the extracted lignin in accordance with the published data.