Title:
Thermo-chemical Conversion of Lignin in a Three-phase-system
Author(s):
Zurbel, A., Aubel, I., Bertau, M.
Document(s):
Paper
Poster
Abstract:
The production of aromatic compounds as well as coke with high calorific value through the hydrothermal depolymerisation in a three-phase-system (water/n-butanol/carbon dioxide) were investigated. For this purpose, a commercially available Kraft lignin was converted under sub- and supercritical conditions in the temperature range of 270 °C to 400 °C. Conversions were examined in the two-phase-system water/carbon dioxide as well as the three-phase-system water/n-butanol/carbon dioxide. To evaluate the conversion process gaseous phase, liquid phase and coke were separated and analysed with the goal to identify product streams for technical applications. Hence, elemental analysis, GC, GC-MS and surface measurements were conducted. The comparison of the two-phase and three-phase-system shows that the conversion rate can be significantly increased from max. 65 % to 98 %. The obtained amounts of biochar show low surface areas (= 40 m²/g), but lower heating values (LHV) of approximately 30 MJ/kg and enhanced fuel characteristics. As expected gasification increases with temperature rise and shifts from 98 % CO2 by 270 °C up to 46 % H2 at 400 °C.
Keywords:
batch reactor, lignin, liquefaction, thermochemical conversion
Topic:
Biomass Conversion Technologies for Energy Carriers, Chemicals and Materials
Subtopic:
Hydrothermal processing
Event:
27th European Biomass Conference and Exhibition
Session:
3AV.4.11
Pages:
1139 - 1143
ISBN:
978-88-89407-19-6
Paper DOI:
10.5071/27thEUBCE2019-3AV.4.11
Price:
FREE
