Effects of hydrothermal carbonization on products from fast pyrolysis of cellulose. (December 2021)

• Record Type: Journal Article
• Authors: Güdücü, Isa; Alper, Koray; Evcil, Tolgahan; Tekin, Kubilay; Ohtani, Hajime; Karagöz, Selhan
• Is Part Of: Journal of the Energy Institute. Volume 99(2021)
• Page Start: 299
• Page End: 306
• Publication Date: 2021-12
• Subjects: Hydrochars -- Cellulose -- Pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) -- 2-Methylfuran; Power (Mechanics) -- Periodicals; Power resources -- Periodicals; Fuel -- Periodicals; 621.04205
• DOI: 10.1016/j.joei.2021.10.004
• Languages: English
• ISSNs: 1743-9671

Abstract

Abstract: In the first step of this study, the hydrothermal carbonization (HTC) of cellulose was performed at 225 and 250 °C for 4, 8 and 12 h. The effect of temperature and residence time on hydrochar (HC) yields and characteristics was investigated, and the highest hydrochar yield had a heating value of 21.06 MJ/kg. In the second step, cellulose and hydrochar-derived cellulose was subjected to fast online pyrolysis at 500, 600 and 700 °C, using a pyrolysis-gas chromatography-mass spectrometry system. The HTC process significantly affected the pyrolysis products. The major decomposition product resulting from the fast pyrolysis of cellulose was levoglucosan, but at all tested temperatures, 2-methylfuran was the major product from hydrochars. Increasing the pyrolysis temperature caused a decrease in the relative yield of 2-methylfuran. Another prominent compound observed in pyrolyzates was 2, 5-dimethylfuran. The relative yields of these two compounds decreased when the residence time of the HTC process was increased. The highest 2-methylfuran selectivity was 67.4%, while the highest 2, 5-dimethylfuran selectivity among the furanic compounds was 24.0%. This study demonstrated that, by combining HTC and pyrolysis processes, fine chemicals can be produced from cellulose. Graphical abstract: Image 1 Highlights: Py-GC-MS of cellulose hydrochars were conducted at 500, 600 and 700 °C. Furanic species had the largest peak areas under all conditions. 2-Methylfuran was the most abundant product from hydrochars at all tested conditions. The highest 2-methhyfuran selectivity was 67.4%.