Characterization of Hydrochars Produced by Hydrothermal Carbonization of Lignin, Cellulose, d-Xylose, and Wood Meal

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• 作者：Shimin Kang ; Xianglan Li ; Juan Fan ; Jie Chang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：July 4, 2012
• 年：2012
• 卷：51
• 期：26
• 页码：9023-9031
• 全文大小：576K
• 年卷期：v.51,no.26(July 4, 2012)
• ISSN：1520-5045

文摘

Hydrothermal carbonization of cellulose, lignin, d-xylose (substitute for hemicellulose), and wood meal (WM) was experimentally conducted between 225 and 265 掳C, and the chemical and structural properties of the hydrochars were investigated. The hydrochar yield is between 45 and 60%, and the yield trend of the feedstock is lignin > WM > cellulose > d-xylose. The hydrochars seem stable below 300 掳C, and aromatic structure is formed in all of these hydrochars. The C content, C recovery, energy recovery, ratio of C/O, and ratio of C/H in all of these hydrochars are among 63鈥?5%, 80鈥?7%, 78鈥?9%, 2.3鈥?.1, and 12鈥?5, respectively. The higher heating value (HHV) of the hydrochars is among 24鈥?0 MJ/kg, with an increase of 45鈥?1% compared with the corresponding feedstock. The carbonization mechanism is proposed, and furfural is found to be an important intermediate product during d-xylose hydrochar production, while lignin hydrothermal carbonization products are made of polyaromatic hydrochar and phenolic hydrochar. The formation of microspheres on the surface of cellulose and WM hydrochars is discussed, and transformation of the hemicellulose should be the reaction for WM microsphere production.