苯甲酸甲酯气相原位加氢制苯甲醛

Gas phase in-situ hydrogenation of methyl benzoate to benzaldehyde

提出了苯甲酸甲酯气相原位加氢制苯甲醛的路线。在常压固定床反应器上研究了浸渍法制备的Cu-MnO/γ-Al2O3双功能催化剂催化苯甲酸甲酯气相原位加氢制苯甲醛的反应性能,考察了催化剂的组成、反应温度、进样速率、酯/醇/水摩尔比等因素对苯甲酸甲酯转化率和苯甲醛选择性的影响。在优化的反应条件(苯甲酸甲酯/甲醇/水摩尔比为0.5/40/40、反应温度为420℃、进样速率为0.1ml·min-1)下,苯甲醛选择性可达到88.5%,苯甲酸甲酯的转化率为79.6%,且Cu-MnO/γ-Al2O3催化剂具有较好的稳定性。根据产物分布提出了苯甲酸甲酯原位加氢的反应机理。该反应体系不需要外部供应氢气,避免了氢气的生产和运输,简化了反应工艺。

An in-situ hydrogenation process of methyl benzoate （MB） proposed. A Cu-MnO/γ-Al2O3 bi-functional catalyst was prepared with used for the proposed process. The effects of catalyst composition, molar ratio of methyl benzoate/methanol/water in the feed on the to the benzaldehyde in gas phase was impregnation method, and was reaction tempe conversion of rature, feeding rate, and methyl benzoate and the selectivity of benzaldehyde were investigated with a fixed-bed reactor under atmospheric pressure. Under the optimal conditions （molar ratio of MB/methanol/water, 40, 420℃, 0.1 ml · min^-1） , the selectivity of benzaldehyde was 79.6%. In addition, the Cu-MnO/γ-Al2O3 catalyst was reaction mechanism was proposed based on the product distri q b temperature and feeding rate were 0. 5/40/ reached 88.5%, and the conversion of MB uite stable for such a reaction. Moreover, a ution of the in-situ hydrogenation of methyl benzoate to benzaldehyde. In this process, external supply of hydrogen was not needed, which is different from the traditional hydrogenation process in gas phase.