A kinetic study on the hydrolysis of corncob residues to levulinic acid in the FeCl3–NaCl system
A kinetic study on the hydrolysis of corncob residues to levulinic acid in the FeCl3–NaCl system
复制标题
DOI：
10.1007/s10570-019-02711-7
复制
发表时间：
2019-09
期刊：
影响因子：
5.7
通讯作者：
Chao Wang;Guihua Yang;Xueming Zhang;Lupeng Shao;Gaojin Lyu;J. Mao;Shijie Liu;Feng Xu
中科院分区：
文献类型：
--
作者：
Chao Wang;Guihua Yang;Xueming Zhang;Lupeng Shao;Gaojin Lyu;J. Mao;Shijie Liu;Feng Xu
以玉米芯酸解残渣（CAHR）为原料，在绿色盐溶液中，以FeCl 3为刘易斯酸催化剂，研究了乙酰丙酸（LA）的合成。在160-180 °C的温度范围内测定了反应动力学关系，FeCl 3浓度为0.12-0.36 M，反应时间为0-60 min。在170 °C下，在含有0.24 M FeCl 3的30% NaCl溶液中实现了59.0 mol%（24.5 g/L）的最大LA浓度。提出了纤维素降解为LA的准一级动力学模型。该模型与CAHR水解过程中葡萄糖、5-羟甲基糠醛和LA等主要化合物浓度的变化完全吻合。为CAHR开发的动力学模型与先前为其他木质纤维素系统开发的动力学模型一致。基于我们的动力学模型和反应系统，LA产率在温度范围的较低端随着酸浓度的增加而增加。结果表明，海水淡化后的浓缩液可以作为生物炼制的绿色溶剂。
Levulinic acid (LA) production from corncob acid hydrolysis residues (CAHR) using FeCl3as Lewis acid catalyst in green solutions of salt was investigated. The reaction kinetic relationships were determined in the temperature range of 160–180 °C, with FeCl3concentrations of 0.12–0.36 M, and a reaction time of 0–60 min. The maximum LA concentration of 59.0 mol% (24.5 g/L) was achieved at 170 °C in a 30% NaCl solution containing 0.24 M FeCl3. A pseudo first-order kinetic model was proposed to describe the cellulose deconstruction to LA. The model agreed perfectly with the evolution in the concentrations of the major compounds such as glucose, 5-hydroxymethylfurfural and LA during the CAHR hydrolysis. The kinetic model developed for CAHR was in good agreement with that previously developed for other lignocellulosic systems. Based on our kinetic model and reaction system, the LA yield is increased at the lower end of the temperature range with the higher acid concentrations. The results indicated that the concentrated seawater after desalination could be a green solvent in the biorefinery.