STUDY OF LIGNIN SEPARATION FROM HYDROLYSIS LIQUOR AND ITS SULFONATION PROCESS
DOI:
https://doi.org/10.66960/jof.3093-8899.00040Keywords:
hydrolysis liquor, lignin, acid precipitation, sulfuric acid, pH, IR spectrum, sulfonation, lignosulfonic acidAbstract
The article studies the separation of lignin from hydrolysis liquor by acid precipitation and the sulfonation process of the obtained lignin. The hydrolysis liquor was first passed through a 50–200 µm polypropylene filter and heated at 80–90 °C for 2–4 h. For lignin precipitation, the pH of the liquid was reduced to 1.8–2.2 by adding concentrated H₂SO₄. As a result of acid precipitation, approximately 97% of the lignin was precipitated within 60–80 min. The IR spectrum of the obtained lignin showed aliphatic C–H vibrations at 2929 and 2853 cm⁻¹, aromatic C=C vibrations at 1593.20 cm⁻¹, C–O vibrations at 1076.28 and 1037.70 cm⁻¹, and aromatic ring C–H vibrations in the range of 896.90–692.44 cm⁻¹. At the next stage, the processes related to lignin sulfonation and the formation of lignosulfonic acid, as well as the corresponding IR spectral characteristics, were analyzed.
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Copyright © 2026 Fotima Xolmatova, Husniddin Rahimov, Hasan Qodirov, Eldor Mashayev, Shoyunus Obidov, Utkirbek Azamatov
This work is licensed under a Creative Commons Attribution 4.0 International License.
This work is licensed under a Creative Commons Attribution 4.0 International License.
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