W. Ketren and J. Wannapeera and Z. Heishun and A. Ryuichi and K. Toshiteru and M. Kouichi and O. Hideaki
The Mechanism Study of Degradative Solvent Extraction of Biomass by Liquid MembraneFourier Transform Infrared Spectroscopy
9 - 13
2018
12
1
International Journal of Physical and Mathematical Sciences
https://publications.waset.org/pdf/10008709
https://publications.waset.org/vol/133
World Academy of Science, Engineering and Technology
Degradative solvent extraction is the method developed for biomass upgrading by dewatering and fractionation of biomass under the mild condition. However, the conversion mechanism of the degradative solvent extraction method has not been fully understood so far. The rice straw was treated in 1methylnaphthalene (1MN) at a different solventtreatment temperature varied from 250 to 350 oC with the residence time for 60 min. The liquid membraneFourier Transform Infrared Spectroscopy (FTIR) technique is applied to study the processing mechanism indepth without separation of the solvent. It has been found that the strength of the oxygenhydrogen stretching (36003100 cm1) decreased slightly with increasing temperature in the range of 300350 oC. The decrease of the hydroxyl group in the solvent soluble suggested dehydration reaction taking place between 300 and 350 oC. FTIR spectra in the carbonyl stretching region (18001600 cm1) revealed the presence of esters groups, carboxylic acid and ketonic groups in the solventsoluble of biomass. The carboxylic acid increased in the range of 200 to 250 oC and then decreased. The prevailing of aromatic groups showed that the aromatization took place during extraction at above 250 oC. From 300 to 350 oC, the carbonyl functional groups in the solventsoluble noticeably decreased. The removal of the carboxylic acid and the decrease of esters into the form of carbon dioxide indicated that the decarboxylation reaction occurred during the extraction process.
Open Science Index 133, 2018