Le Guenic Sarah, Gergela David, Ceballos Claire, Delbecq Frederic, Len Christophe
Université de Technologie de Compiègne (UTC), CS 60319, 60203 Compiègne Cedex, France.
Department of Chemistry, Faculty of Technology, 760 01 Zlin, Czech Republic.
Molecules. 2016 Aug 22;21(8):1102. doi: 10.3390/molecules21081102.
Pentose dehydration and direct transformation of xylan into furfural were performed in a water-cyclopentyl methyl ether (CPME) biphasic system under microwave irradiation. Heated up between 170 and 190 °C in the presence of Nafion NR50 and NaCl, d-xylose, l-arabinose and xylan gave furfural with maximum yields of 80%, 42% and 55%, respectively. The influence of temperature and reaction time on the reaction kinetics was discussed. This study was also completed by the survey of different reactant ratios, such as organic layer-water or catalyst-inorganic salt ratios. The exchange between proton and cation induced by an excess of NaCl was monitored, and a synergetic effect between the remaining protons and the released HCl was also discovered.
在微波辐射下，在水 - 环戊基甲基醚（CPME）双相体系中进行戊糖脱水以及木聚糖直接转化为糠醛的反应。在170至190°C的温度下，在全氟磺酸离子交换膜NR50和氯化钠存在的条件下，D - 木糖、L - 阿拉伯糖和木聚糖分别生成糠醛，最大产率分别为80%、42%和55%。讨论了温度和反应时间对反应动力学的影响。本研究还通过考察不同反应物比例，如有机层与水的比例或催化剂与无机盐的比例来完成。监测了过量氯化钠引起的质子与阳离子之间的交换，并且还发现了剩余质子与释放的盐酸之间的协同效应。
