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首页> 外文期刊>RSC Advances >Synergistic catalytic effect of the ZnBr2-HCl system for levulinic acid production using microwave irradiation
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Synergistic catalytic effect of the ZnBr2-HCl system for levulinic acid production using microwave irradiation

机译：ZnBr2-HCl系统的协同催化效应使用微波辐射产生乙酰丙酸生产

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A catalytic process for the selective conversion of carbohydrates to levulinic acid is developed. A synergy in the catalytic action is observed when a combination of ZnBr2 and HCl was used as the catalyst which is attributed to the in situ generation of HBr. Carbohydrates, namely, glucose, molasses and sucrose, were employed as feedstock for levulinic acid production. Microwave irradiation of glucose either in the presence of HCl alone or both HCl and ZnBr2 as catalysts yielded the formation of levulinic acid. But the conversion of glucose to levulinic acid was much faster (only 6 min) when both HCl and ZnBr2 were employed together. The effect of the reaction parameters like, the time of irradiation, % power, and amount of substrate and catalyst on the yield of levulinic acid were studied. The reaction products in each case were analysed using H-1 and C-13 NMR. The yield of levulinic acid was estimated using HPLC. The maximum yield of levulinic acid obtained from glucose was 53 wt%.
机译：开发了一种催化方法，用于选择性转化碳水化合物与乙酰硫酸的催化过程。 当ZnBr2和HCl的组合用作归因于HBr的原位产生催化剂时，观察到催化作用的协同作用。 碳水化合物，即葡萄糖，糖蜜和蔗糖，用作乙酰酸生产的原料。 作为催化剂的单独或HCl和ZnBr2在HCl存在下，葡萄糖的微波辐射产生乙酰酸的形成。 但是当将HCl和ZnBr2一起使用时，葡萄糖转化为乙酰氨酸的转化率快得多（仅6分钟）。 研究了反应参数的效果，研究了辐照，％功率和基材的碱和催化剂的含量，对乙酰硫酸产率进行了研究。 使用H-1和C-13 NMR分析每种情况下的反应产物。 使用HPLC估计紫水酸的产率。 由葡萄糖所获得的紫水酸的最大收率为53wt％。

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