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在高剪切混合乳化机搅拌下,通过对Cr2O72- /Cr3+和 Ce4+/Ce3+两种媒质间接合成对甲氧基苯甲醛槽外反应的研究,得到合成对甲氧基苯甲醛的优选条件分别为:原料配比n(Cr2O72-):n(p-CH3O-C6H4-CH3)=1:6,反应温度 80℃,反应时间10min,对甲氧基苯甲醛反应收率90.5%;原料配比 n(Ce4+):n(p-CH3O-C6H4-CH3)=1:1,反应温度30℃,反应时间6min,对甲氧基苯甲醛反应收率97.1%。结果表明,Ce4+/Ce3+做媒质产品时-空效率较低,这是Ce4+/Ce3+媒质存在的本质缺陷;而Cr2O72-/Cr3+做媒质产品时-空效率提高近2倍,显著地增加产品的产量,提高了经济效益。
Under the condition of high shear mixing emulsifier, the optimal conditions for the synthesis of p-methoxybenzaldehyde were obtained by indirect reaction of p-methoxybenzaldehyde with Cr2O72- / Cr3 + and Ce4 + / Ce3 + : The reaction rate of p-methoxybenzaldehyde was 90.5% with the ratio of raw materials n (Cr2O72-): n (p-CH3O-C6H4-CH3) = 1: 6, the reaction temperature was 80 ℃ and the reaction time was 10min. (Ce4 +): n (p-CH3O-C6H4-CH3) = 1: 1, the reaction temperature was 30 ℃ and the reaction time was 6min. The yield of p-methoxybenzaldehyde was 97.1%. The results show that when Ce4 + / Ce3 + is a medium product, the void-efficiency is low, which is the intrinsic defect of Ce4 + / Ce3 + medium. When Cr2O72- / Cr3 + is used as the medium, the space-time efficiency increases nearly two times, , Improve economic efficiency.