Oxytree Pruned Biomass Torrefaction: Process Kinetics

Świechowski, Kacper
Stegenta-Dąbrowska, Sylwia
Liszewski, Marek
Bąbelewski, Przemysław
Koziel, Jacek
Białowiec, Andrzej
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Oxytree is a fast-growing energy crop with C4 photosynthesis. In this research, for the first time, the torrefaction kinetic parameters of pruned Oxytree biomass (Paulownia clon in Vitro 112) were determined. The influence of the Oxytree cultivation method and soil class on the kinetic parameters of the torrefaction was also investigated. Oxytree pruned biomass from a first-year plantation was subjected to torrefaction within temperature range from 200 to 300 °C and under anaerobic conditions in the laboratory-scale batch reactor. The mass loss was measured continuously during the process. The relative mass loss increased from 1.22% to 19.56% with the increase of the process temperature. The first-order constant rate reaction (k) values increased from 1.26 × 10−5 s−1 to 7.69 × 10−5 s−1 with the increase in temperature. The average activation energy for the pruned biomass of Oxytree torrefaction was 36.5 kJ∙mol−1. Statistical analysis showed no significant (p < 0.05) effect of the Oxytree cultivation method and soil class on the k value. The results of this research could be useful for the valorization of energy crops such as Oxytree and optimization of waste-to-carbon and waste-to-energy processes.


This article is published as Świechowski, Kacper, Sylwia Stegenta-Dąbrowska, Marek Liszewski, Przemysław Bąbelewski, Jacek A. Koziel, and Andrzej Białowiec. "Oxytree Pruned Biomass Torrefaction: Process Kinetics." Materials 12, no. 20 (2019): 3334. DOI: 10.3390/ma12203334. Posted with permission.

Oxytree, Paulownia, torrefied biomass, pruned biomass, valorization, renewable energy, fast-growing biomass, energy crops, brownfields, kinetics parameters, activation energy