Efficient and environmentally-friendly dehydration of fructose and treatments of bagasse under the supercritical CO2 system
Efficient and environmentally-friendly dehydration of fructose and treatments of bagasse under the supercritical CO2 system
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超临界CO2系统高效环保果糖脱水及甘蔗渣处理
DOI：
10.1016/j.renene.2020.07.123
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发表时间：
2020-12-01
期刊：
影响因子：
8.7
通讯作者：
Chen, Li
中科院分区：
文献类型：
--
作者：
Ji, Qinghua;Jiang, Haonan;Chen, Li
研究了超临界/亚临界二氧化碳（SC/Sub-CO2）催化果糖合成5-羟甲基糠醛（5-HMF）的性能。确定了SC/Sub-CO2体系转化的最佳条件，并以1-丁基-3-甲基咪唑乙酸盐（[Bmim]OAc）为催化剂，采用SC-CO2对甘蔗渣（SCB）进行预处理。采用傅里叶变换红外光谱（FT-IR）、X射线衍射仪（XRD）、热重分析（TG）、固体核磁共振（C-13 NMR）和扫描电子显微镜（SEM）对SCB样品进行了结构分析。测定了酸水解液和酶水解液中糖的含量。结果表明，SC-CO2/[Bmim]Cl体系的最佳果糖转化条件为9 MPa、120 ℃、0.5 h; Sub-CO2/H2O体系的最佳果糖转化条件为6 MPa、180 ℃、2 h。SC-CO2/[Bmim]OAc预处理效果最好，木质素和半纤维素的去除率分别为8.78%和4.83%。FT-IR、SEM、XRD和TG分析表明，SC-CO2/[Bmim] OAM预处理改变了SCB的表面形态，增加了结晶度，降低了热稳定性。酶解和酸解的还原糖得率分别提高了12.57%和22.04%。能量平衡表明，SC-CO2/[Bmim]OAc预处理能有效提高SCB的能量输出。(C)2020爱思唯尔有限公司保留所有权利。
The ability of supercritical/subcritical carbon dioxide (SC/Sub-CO2) to catalyze the production of 5-hydroxymethylfurfural (5-HMF) from fructose was studied in this paper. The optimal conditions for the conversion in SC/Sub-CO2 systems were determined, and sugarcane bagasse (SCB) was pretreated with SC-CO2 using 1-butyl-3-methylimidazolium acetate ([Bmim]OAc). Structural analysis of SCB samples was done by Fourier transform infrared (FT-IR), X-ray Diffractometer (XRD), Thermal gravimetric (TG), Solid state nuclear magnetic resonance (C-13 NMR) and scanning electron microscope (SEM) analyses. The contents of sugars in the acid and enzymatic hydrolysates were measured. The results showed that the optimum fructose conversion conditions of the SC-CO2/[Bmim]Cl system were 9 MPa, 120 degrees C and 0.5 h and the Sub-CO2/H2O system were 6 MPa, 180 degrees C and 2 h. Besides, SC-CO2/[Bmim]OAc was the most effective pretreatment process, with the lignin and hemicellulose removal rates in SCB being 8.78 and 4.83% respectively. FT-IR, SEM, XRD and TG analysis indicated that the SC-CO2/[Bmim]OAc pretreatment changed surface morphology, increased crystallinity and decreased thermal stability of SCB. Moreover, the yield of reducing sugars obtained by enzymatic and acid hydrolysis increased by 12.57 and 22.04%, respectively. The energy balance showed that SC-CO2/[Bmim]OAc pretreatment was efficient to increase the energy output of SCB. (C) 2020 Elsevier Ltd. All rights reserved.