School of Environment, Beijing Normal University, Beijing 100875, China.
Bioresour Technol. 2012 Dec;126:391-6. doi: 10.1016/j.biortech.2012.03.001. Epub 2012 Mar 10.
A flow reaction system was utilized to investigate lignocellulose conversion using combined supercritical/subcritical conditions for hexose production. Initially, investigation of cellulose hydrolysis in supercritical water and optimization of reaction parameters were done. Oligosaccharide yields reached over 30% at cellulose concentrations of 3-5 gL(-1) and reaction times of 6-10s at 375 °C, and 2.5-4 gL(-1) and 8-10s at 380 °C. Temperatures above 380 °C were not appropriate for the supercritical phase in the combined process. Subsequently, conversion of lignocellulosic materials under combined supercritical/subcritical conditions was studied. Around 30% hexose was produced from corn stalks under the optimal parameters for supercritical (380 °C, 23-24 MPa, 9-10s) and subcritical (240 °C, 8-9 MPa, 45-50s) phases. Flow systems utilizing the combined supercritical/subcritical technology present a promising method for lignocellulosic conversion. The results of this study provide an important guide for the operational optimization and practical application of the proposed system.
采用流动反应系统，利用结合超临界/亚临界条件进行己糖生产，研究木质纤维素的转化。首先，在超临界水中进行纤维素水解的研究，并优化反应参数。在 375°C 时，纤维素浓度为 3-5 g/L 和反应时间为 6-10s 时，寡糖产率超过 30%；在 380°C 时，纤维素浓度为 2.5-4 g/L 和反应时间为 8-10s 时，寡糖产率超过 30%。在结合工艺中超临界相的温度高于 380°C 是不合适的。随后，研究了木质纤维素材料在结合超临界/亚临界条件下的转化。在超临界（380°C、23-24 MPa、9-10s）和亚临界（240°C、8-9 MPa、45-50s）条件下的最佳参数下，从玉米秸秆中得到了约 30%的己糖。利用结合超临界/亚临界技术的流动系统为木质纤维素转化提供了一种很有前途的方法。本研究的结果为所提出系统的操作优化和实际应用提供了重要指导。
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