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Title

Hydrothermal base catalysed treatment of Kraft lignin - time dependent analysis and a techno-economic evaluation for carbon fibre applications

AuthorsOtromke, M.; Shuttleworth, Peter S. CSIC ORCID ; Sauer, J.; White, R. J.
KeywordsKraft lignin
Hydrothermal treatment
Base catalysed depolymerization
Techno-economic analysis
Bio-aromatics
Issue Date2019
PublisherElsevier
CitationBioresource Technology Reports 6: 241-250 (2019)
AbstractThe hydrothermal base-catalysed treatment of industrial Kraft lignin (KL) is investigated as a basis for production of a sustainable carbon fibre precursor, with a focus on the time-dependent evolution and impact on precursor properties. Hydrothermal treatment was performed at T = 300 °C and p = 180 bar, with the retention time (t) varied between 8, 12, 16, 20, and 24 mins. Molecular weight distribution and thermal stability of the processed lignin were close to maximum after 8 min, and 12–16 min respectively. Chemical modification was found to continue (e.g. demethoxylation) over the entire t range (24 min). Analysis of the recovered oily phase indicated catechol derivatives were stable end-products with, e.g., vanillin and guaiacol as intermediates. A techno-economic analysis indicated a price of ca. 1600 €/t at a production capacity of 10 kt/a is achievable, with main cost-drivers being lignin (60%), fixed costs (20%), and energy (10%).
Publisher version (URL)http://dx.doi.org/10.1016/j.biteb.2019.03.008
URIhttp://hdl.handle.net/10261/203178
DOIhttp://dx.doi.org/10.1016/j.biteb.2019.03.008
Identifiersdoi: 10.1016/j.biteb.2019.03.008
issn: 2589-014X
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