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Article

Pyrolysis Kinetics of Hydrochars Produced from Brewer’s Spent Grains

1
Department of Conversion Technologies of Biobased Resources, Institute of Agricultural Engineering, University of Hohenheim, Garbenstrasse 9, 70599 Stuttgart, Germany
2
Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(7), 625; https://doi.org/10.3390/catal9070625
Received: 3 July 2019 / Revised: 15 July 2019 / Accepted: 17 July 2019 / Published: 22 July 2019
(This article belongs to the Special Issue Catalysis in Lignocellulosic Biomass Conversion)
The current market situation shows that large quantities of the brewer’s spent grains (BSG)—the leftovers from the beer productions—are not fully utilized as cattle feed. The untapped BSG is a promising feedstock for cheap and environmentally friendly production of carbonaceous materials in thermochemical processes like hydrothermal carbonization (HTC) or pyrolysis. The use of a singular process results in the production of inappropriate material (HTC) or insufficient economic feasibility (pyrolysis), which hinders their application on a larger scale. The coupling of both processes can create synergies and allow the mentioned obstacles to be overcome. To investigate the possibility of coupling both processes, we analyzed the thermal degradation of raw BSG and BSG-derived hydrochars and assessed the solid material yield from the singular as well as the coupled processes. This publication reports the non-isothermal kinetic parameters of pyrolytic degradation of BSG and derived hydrochars produced in three different conditions (temperature-retention time). It also contains a summary of their pyrolytic char yield at four different temperatures. The obtained KAS (Kissinger–Akahira–Sunose) average activation energy was 285, 147, 170, and 188 kJ mol−1 for BSG, HTC-180-4, HTC-220-2, and HTC-220-4, respectively. The pyrochar yield for all hydrochar cases was significantly higher than for BSG, and it increased with the severity of the HTC’s conditions. The results reveal synergies resulting from coupling both processes, both in the yield and the reduction of the thermal load of the conversion process. According to these promising results, the coupling of both conversion processes can be beneficial. Nevertheless, drying and overall energy efficiency, as well as larger scale assessment, still need to be conducted to fully confirm the concept. View Full-Text
Keywords: hydrothermal carbonization; pyrolysis; kinetics; hydrochar; biomass; spent grain; lignocellulose; waste valorization hydrothermal carbonization; pyrolysis; kinetics; hydrochar; biomass; spent grain; lignocellulose; waste valorization
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MDPI and ACS Style

Olszewski, M.P.; Arauzo, P.J.; Maziarka, P.A.; Ronsse, F.; Kruse, A. Pyrolysis Kinetics of Hydrochars Produced from Brewer’s Spent Grains. Catalysts 2019, 9, 625. https://doi.org/10.3390/catal9070625

AMA Style

Olszewski MP, Arauzo PJ, Maziarka PA, Ronsse F, Kruse A. Pyrolysis Kinetics of Hydrochars Produced from Brewer’s Spent Grains. Catalysts. 2019; 9(7):625. https://doi.org/10.3390/catal9070625

Chicago/Turabian Style

Olszewski, Maciej P., Pablo J. Arauzo, Przemyslaw A. Maziarka, Frederik Ronsse, and Andrea Kruse. 2019. "Pyrolysis Kinetics of Hydrochars Produced from Brewer’s Spent Grains" Catalysts 9, no. 7: 625. https://doi.org/10.3390/catal9070625

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