以蔗渣为原料制备生物汽油中间体5-氯甲基糠醛

Preparation of 5-chloromethylfurfural as potential intermediate for biofuels using bagasses as raw material

该文对蔗渣在温和条件(75～95℃)下转化制备5-氯甲基糠醛(5-CMF)的一锅法反应进行了研究,考察了AlCl3、LiCl、NaCl、KCl、MgCl2、CaCl2、BaCl2、CrCl3、NiCl2和FeCl3的催化效果,并利用GC-MS、1HNMR和FT-IR对目标产物进行了表征。研究结果表明:供试用的金属氯化物都具有一定的催化效果,其中AlCl3的催化效果明显优于碱金属、碱土金属和过渡金属氯化物;以AlCl3为催化剂,考察了反应温度、反应时间和AlCl3浓度对5-CMF产率的影响。得到反应的最佳条件为反应温度85℃,反应时间3h和AlCl3质量浓度为6.0g/L。在最优反应条件下5-CMF的产率为72%。该研究结果,对利用各种纤维素废弃物,开发潜在的生物汽油具有重要价值。

The One-pot conversion of bagasses into 5-chloromethylfurfural under mild conditions （75-95℃） was investigated. The catalytic efficiencies of ten metal chlorides （AlCl3, MgCl2 etc.） were studied, and the desired product was characterized by GC-MS, 1H-nuclear magnetic and infrared spectrum. The experimental results illustrated that all these tested metal chlorides can catalyze the conversion of bagasses into 5-CMF, and AlCl3 was the optimum catalyst in these catalysts including chlorides of alkali metal, alkaline earth metal and transition metal. With AlCl3 as the catalyst, the reaction conditions such as reaction temperature, reaction time, amount of AlCl3 were optimized. The optimum conditions were as follows： use 6.0 g/L AlCl3, 85℃ for 3 h, and the yield of 5-CMF was 72%. This work will provide an important framework for the development of potential biofuels using bagasse as materials.