Supercritical extraction of biomass as an effective pretreatment step for the char yield control in pyrolysis

RENEWABLE ENERGY

卷:170

Article

Trubetskaya, Anna¹  Budarin, Vitaliy²  Arshadi, Mehrdad³  Magalhaes, Duarte⁴  Kazanc, Feyza⁴  Hunt, Andrew John^5,6 

[1] Univ Limerick, Dept Chem Sci, Limerick V94 T9PX, Ireland

[2] Univ York, Dept Chem, York YO10 5DD, N Yorkshire, England

[3] Swedish Univ Agr Sci, Dept Forest Biomat & Technol, S-90183 Umea, Sweden

[4] Middle East Tech Univ, Mech Engn Dept, Ankara, Turkey

[5] Khon Kaen Univ, Fac Sci, Mat Chem Res Ctr, Dept Chem, 123 Mittraparb Rd, Khon Kaen 40002, Thailand

[6] Khon Kaen Univ, Fac Sci, Ctr Excellence Innovat Chem, 123 Mittraparb Rd, Khon Kaen 40002, Thailand

关键词: Supercritical extraction;    Char yield;    Scots pine;    Heating rate;    Fluidisation;   

DOI  :  10.1016/j.renene.2021.01.116

来源: Elsevier

【 摘 要 】

This work demonstrates that the coupling of supercritical carbon dioxide extraction with pyrolysis is an effective method for the removal of extractives from forestry residues and generation of solid char with different properties from the remaining solid wood fractions. Extraction of the needles and stumps shows greater yields of resin acids, terpenes, steroids and other derivatives than that of pinewood bark, cones and branches. The char yields of both non-treated and scCO(2) extracted wood fractions varied from approximately 17.5 to 38.5 wt. % on dry basis at fast heating rates. The catalytic effect of extractives is significant on the yields and morphology of solid chars in fast pyrolysis and less pronounced at slow heating rates. These results are promising as they show that both the composition and location of extractives inclusions in the interior of wood particle can affect the morphology of char samples. Moreover, the impact of alkali metals on the wood devolatilization appears to be less compared to the lignocellulosic composition in slow pyrolysis. These results demonstrate that supercritical carbon dioxide extraction can be integrated in biorefinery as a pretreatment step to control the properties of pyrolysis products by varying the heating rate. (C) 2021 The Author(s). Published by Elsevier Ltd.

【 授权许可】

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