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Transformation of Hydrolysis Lignin in an Aqueous Medium under Sub- and Supercritical Conditions

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Abstract

Aqueous solutions of depolymerized lignin with a concentration of 12 to 15 g/L are obtained by treating an aqueous suspension of hydrolysis lignin (LG-PP) for 4 hours at 250°C and 10 MPa. The transformation of lignin in the resulting solution is studied at sub- (320°C, 30 MPa) and supercritical (400–650°C, 30 MPa) parameters in a flow-type reactor. It is shown that the degree of depolymerization of lignin increases with increasing temperature and reaches its maximum value at 650°C; the process results in the formation of hydrocarbons of various groups including derivatives of benzene and phenol. Intensive gasification of lignin with the production of gas mixtures containing up to 40 vol % hydrogen occurs at temperatures above 600°C.

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Funding

This study was supported by the Russian Foundation for Basic Research (grant no. 18-29-06072).

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Authors and Affiliations

  1. Department of Chemistry, Moscow State University, 119991, Moscow, Russia

    N. A. Bobrova

  2. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    N. A. Bobrova, I. I. Mishanin, A. E. Koklin & V. I. Bogdan

Authors
  1. N. A. Bobrova
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  2. I. I. Mishanin
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  3. A. E. Koklin
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  4. V. I. Bogdan
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Corresponding authors

Correspondence to N. A. Bobrova, I. I. Mishanin, A. E. Koklin or V. I. Bogdan.

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The authors declare that they have no conflict of interest.

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Translated by E. Boltukhina

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Bobrova, N.A., Mishanin, I.I., Koklin, A.E. et al. Transformation of Hydrolysis Lignin in an Aqueous Medium under Sub- and Supercritical Conditions. Russ. J. Phys. Chem. B 16, 1200–1203 (2022). https://doi.org/10.1134/S199079312207003X

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  • DOI: https://doi.org/10.1134/S199079312207003X

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