磷钨杂多酸催化合成苯甲醛1,2-丙二醇缩醛

Synthesis of Benzaldehyde 1,2-propanediol acetal by Phosphotungstic Heteropolyacid

以自制磷钨杂多酸H3PW12O40为多相催化剂,以苯甲醛和1,2-丙二醇为原料合成苯甲醛1,2-丙二醇缩醛,较系统地研究了原料摩尔比、催化剂用量、反应时间诸因素对产品收率的影响。实验表明:适宜反应条件为n(苯甲醛):n(1,2-丙二醇)=1:1.5,催化剂用量为反应物料总质量的0.5%,环己烷为带水剂,反应时间0.5h。上述条件下,苯甲醛1,2-丙二醇缩醛的收率为81.9%。

Using the phosphotungstic heteropolyacid （H3PW12O40）for heterogeneous catalyst, the benzaldehydel,2-propanediol acetal is synthesized from the raw material of benzaldehyde and 1,2-propanediol. In this paper, the factors of the raw materials ratio, the amount of catalyst, the reaction time affecting the yield of the product are systematic studied. Experiments show that： appropriate conditions for the n （benzaldehyde）：n （1,2-propanediol）=1：1.5, the amount of catalyst for the reaction for 0.5%of the quality of materials, cyclohexane for with water, the reaction time of 0.5h.Under these conditions, the yield of the benzaldehydel,2-propanediol acetal can reach to 81.9%.