期刊
JOURNAL OF CLEANER PRODUCTION
卷 196, 期 -, 页码 842-851出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2018.06.062
关键词
Pistachio shell; Carbon dioxide; Biorefinery; Oligosaccharide; Furfural
资金
- Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) [IF/00471/2015, ROTEIRO/0189/2013]
- CAPES
- Erasmus + Programme
The use of high-pressure CO2/H2O in valorisation of pistachio shell to produce hemicellulose-derived, oligomeric and monomeric sugars and their further transformation to furfural as well as enzymatic transformation of cellulose-rich solids is presented in this work. Different pre-treatment conditions i.e. temperature ranged from 160 to 200 degrees C; reaction time varied between 0 and 30 min and liquid to solid mass ratio between 4 and 8 with constant initial pressure of CO2 of 50 bars were examined. At the optimal pre-treatment conditions, the concentrations of xylose and xylo-oligosaccharide were of 1.7 and 35.5 g/L. Furthermore, this work demonstrates the high-pressure CO2 catalysed production of furfural in an aqueous/tetrahydrofuran system. For model solution containing a mixture of xylose and acetic acid, the optimised furfural yield was as high as 53.3 mol%, while for real sample of hemicellulose hydrolysate, the furfural yield of 39.6 mol% and the selectivity of 40.0 mol% were obtained. Additionally, quantitative glucan to glucose conversion by enzymatic hydrolysis of pre-treated cellulose-rich biomasses was achieved. The promising results achieved confirm that the valorisation of food residues such as pistachio shell using greener alternative methods involving high-pressure CO2 is an efficient technology, which can be integrated into the biorefinery concept. (C) 2018 Elsevier Ltd. All rights reserved.
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