In recent years, growing attention has been focused on the use of lignocellulosic biomass as a feedstock for the production of ethanol, a possible renewable alternative to fossil fuels. Several pretreatment processes have been developed for decreasing the biomass recalcitrance, but only a few of them seem to be promising. In this study, effect of various organic solvents and organic acids on the pretreatment of sugarcane bagasse was studied. Among the different organic acids and organic solvents tested, formic acid was found to be effective. Optimization of process parameters for formic acid pretreatment was carried out. The structural changes before and after pretreatment was investigated by scanning electron microscopy, X-ray diffraction (XRD), and Fourier transform infrared (FTIR) analysis. The X-ray diffraction profile showed that the degree of crystallinity was more for pretreated biomass than that of untreated. The FTIR spectra shown at the stretching of hydrogen bonds of pretreated sugarcane bagasse arose at higher number. It also revealed that the cellulose content in the solid residue increased because the hemicelluloses fraction in raw materials was released by acid hydrolytic reaction.

译文

近年来,人们越来越关注使用木质纤维素生物质作为生产乙醇的原料,乙醇是化石燃料的一种可能的可再生替代品。已经开发了几种预处理方法来减少生物质的顽固性,但其中只有少数似乎是有希望的。在这项研究中,研究了各种有机溶剂和有机酸对甘蔗渣预处理的影响。在测试的不同有机酸和有机溶剂中,发现甲酸是有效的。对甲酸预处理的工艺参数进行了优化。通过扫描电子显微镜,x射线衍射 (XRD) 和傅里叶变换红外 (FTIR) 分析研究了预处理前后的结构变化。X射线衍射曲线表明,预处理生物质的结晶度高于未处理生物质的结晶度。预处理甘蔗渣的氢键拉伸时显示的FTIR光谱以较高的数量出现。它还表明,固体残留物中的纤维素含量增加,因为原料中的半纤维素馏分是通过酸水解反应释放的。

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