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Title: Investigation on conversion pathways in degradative solvent extraction of rice straw by using liquid membrane-FTIR spectroscopy
Authors: Ketren, Watcharakorn
Zen, Heishun
Ashida, Ryuichi
Kii, Toshiteru
Ohgaki, Hideaki
Author's alias: 全, 炳俊
蘆田, 隆一
紀井, 俊輝
大垣, 英明
Keywords: biomass
degradative solvent extraction
dewater
Fourier Transform Infrared (FTIR)
rice straw
upgrade
Issue Date: 7-Feb-2019
Publisher: MDPI AG
Journal title: Energies
Volume: 12
Issue: 3
Thesis number: 528
Abstract: Degradative solvent extraction (DSE) is effective in both dewatering and upgrading biomass wastes through the selective removal of oxygen functional groups. However, this conversion mechanism has yet to be elucidated. Here, liquid membrane-FTIR spectroscopy was utilized to examine the main liquid product (Solvent-soluble) without sample modification. Rice straw (RS) and 1-methylnaphthalene (as a non-hydrogen donor solvent) were used as materials, and measurements were performed at treatment temperatures of 200, 250, 300, and 350 °C for 0 min, and at 350 °C for 60 min. The Solvent-soluble spectra were quantitatively analyzed, and changes in the oxygen-containing functional groups and hydrogen bonds at each temperature were used to characterize the DSE mechanism. It was determined that the DSE reaction process can be divided into three stages. During the first stage, 200–300 °C (0 min), oxygen was removed via dehydration, and aromaticity was observed. In the second stage, 300–350 °C (0 min), deoxygenation reactions involving dehydration and decarboxylation were followed by reactions for aromatization. For the third stage, 350 °C (0–60 min), further aromatization and dehydration reactions were observed. Intramolecular reactions are indicated as the predominant mechanism for dehydration in RS DSE, and the final product is composed of smaller molecular compounds.
Rights: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
URI: http://hdl.handle.net/2433/240580
DOI(Published Version): 10.3390/en12030528
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