期刊
HOLZFORSCHUNG
卷 77, 期 3, 页码 159-169出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/hf-2022-0146
关键词
depolymerisation; glycerol; HTL; hydrothermal liquefaction; kraft lignin
Depolymerisation of kraft lignin under hydrothermal conditions was investigated at short residence times (1-12 min) with glycerol being used as a capping agent. The weight average molecular weight (M-w) of the products decreased within the first minute of residence time, with the inter-unit ether linkages breaking accordingly. Furthermore, the M-w of the product fractions decreased at increasing residence times, while the char yield increased. Short residence times thus appear to be beneficial for mitigating the formation of char. Also, addition of NaOH reduced the yield of char. Although the addition of glycerol caused a decrease in the M-w of the products, it seemed to increase the yield of char and therefore might not be a suitable capping agent for kraft lignin depolymerisation.
Depolymerisation of kraft lignin under hydrothermal conditions was investigated at short residence times (1-12 min) with glycerol being used as a capping agent. The weight average molecular weight (M-w) of the products decreased within the first minute of residence time, with the inter-unit ether linkages breaking accordingly. Furthermore, the M-w of the product fractions decreased at increasing residence times, while the char yield increased. Short residence times thus appear to be beneficial for mitigating the formation of char. Also, addition of NaOH reduced the yield of char. Although the addition of glycerol caused a decrease in the M-w of the products, it seemed to increase the yield of char and therefore might not be a suitable capping agent for kraft lignin depolymerisation.
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