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以二氧化硅负载磷钨酸(H3PW12O40/SiO2)为催化剂,苯甲醛和乙二醇为原料合成苯甲醛乙二醇缩醛。探讨H3PW12O40/SiO2对缩醛反应的催化活性,较系统地研究了醛醇物质的量比、催化剂用量、带水剂用量、反应时间等因素对产物收率的影响。实验表明:H3PW12O40/SiO2是合成苯甲醛乙二醇缩醛的良好催化剂;在n(苯甲醛)∶n(乙二醇)=1∶1.5,催化剂用量占反应物量总质量的0.8%,环己烷为带水剂8mL,反应时间45min的最佳条件下,苯甲醛乙二醇缩醛的收率可达60.6%。
Benzaldehyde and ethylene glycol were used as raw materials to synthesize benzaldehyde ethylene glycol acetal with silica supported phosphotungstic acid (H3PW12O40 / SiO2) as catalyst. The catalytic activity of H3PW12O40 / SiO2 on the acetal reaction was discussed. The effects of the ratio of aldol to alcohol, the amount of catalyst, the amount of water-carrying agent and the reaction time on the yield of product were systematically studied. The experimental results show that H3PW12O40 / SiO2 is a good catalyst for the synthesis of benzaldehyde ethylene glycol acetal; the amount of catalyst accounts for 0.8% of the total mass of reactant at n (benzaldehyde): n (ethylene glycol) = 1: Under the optimal conditions of 8mL water-carrying agent and 45min reaction time, the yield of benzaldehyde ethylene glycol acetal reached 60.6%.