一步法制备乙醇酸甲酯的反应研究
发布时间：2018-12-11 17:09
【摘要】：本文研究了乙二醇与甲醇一步氧化酯化制备乙醇酸甲酯的反应。首先进行催化剂的筛选实验,得到了具有良好催化活性的负载型Au/Al2O3催化剂,通过对反应条件的研究,确定了乙醇酸甲酯的最佳合成工艺条件。 在催化剂的筛选阶段,首先考察了一系列Keggin型P-Mo-V杂多酸催化剂。实验结果表明,杂多酸催化剂对乙二醇与甲醇的氧化酯化反应没有催化活性。采用共沉淀法制备负载型Au/Al2O3催化剂,考察了不同Al203载体、Au负载量、催化剂制备过程中的焙烧温度等对反应转化率和选择性的影响。选用比较大的孔径Al203载体、Au负载量为0.5-1.0wt%、经过300℃焙烧2h制备的Au/Al2O3催化剂,显示出良好的催化活性和选择性。 反应条件的研究结果表明,反应温度、压力、氧气浓度和原料配比等对反应转化率和选择性影响很大。适宜的反应条件为：反应温度120℃、反应压力0.45MP、氧气与氮气的分压比1：1-1：2、原料乙二醇和甲醇摩尔比为1：10,乙二醇的转化率和生成乙醇酸甲酯的选择性都达到80%以上。
[Abstract]:The synthesis of methyl glycolate by one-step oxidation esterification of ethylene glycol and methanol was studied in this paper. At first, the supported Au/Al2O3 catalyst with good catalytic activity was obtained by screening the catalyst. The optimum synthesis conditions of methyl glycolate were determined by studying the reaction conditions. In the screening stage, a series of Keggin type P-Mo-V heteropoly acid catalysts were investigated. The experimental results show that the heteropoly acid catalyst has no catalytic activity for the oxidative esterification of ethylene glycol and methanol. Supported Au/Al2O3 catalysts were prepared by coprecipitation method. The effects of different Al203 support, Au loading amount and calcination temperature on the conversion and selectivity of the catalyst were investigated. The Au/Al2O3 catalyst prepared by calcination at 300 鈩，
本文编号：2372918
[Abstract]:The synthesis of methyl glycolate by one-step oxidation esterification of ethylene glycol and methanol was studied in this paper. At first, the supported Au/Al2O3 catalyst with good catalytic activity was obtained by screening the catalyst. The optimum synthesis conditions of methyl glycolate were determined by studying the reaction conditions. In the screening stage, a series of Keggin type P-Mo-V heteropoly acid catalysts were investigated. The experimental results show that the heteropoly acid catalyst has no catalytic activity for the oxidative esterification of ethylene glycol and methanol. Supported Au/Al2O3 catalysts were prepared by coprecipitation method. The effects of different Al203 support, Au loading amount and calcination temperature on the conversion and selectivity of the catalyst were investigated. The Au/Al2O3 catalyst prepared by calcination at 300 鈩，
本文编号：2372918
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