二氧化硅负载磷钨钼酸催化合成苯甲醛乙二醇缩醛

Catalytic synthesis of benzaldehyde glycol acetal by H_3PW_6Mo_6O_(40)/SiO_2

以二氧化硅负载磷钨钼酸(H3PW6Mo6O40/SiO2)为催化剂,用苯甲醛和乙二醇为原料催化合成了苯甲醛乙二醇缩醛,正交实验法探讨得出的适宜反应条件为:固定苯甲醛用量0.2mol,苯甲醛与乙二醇的物质的量之比为1.0∶1.5,催化剂H3PW6Mo6O40/SiO2用量占反应物料总质量的1.0%,反应时间45 min,带水剂环己烷的用量12 mL.在该反应条件下,苯甲醛乙二醇缩醛的收率可达79.6%.

Benzaldehyde glycol acetal was synthesized from benzaldehyde and glycol in the presence of H3PW6Mo6040/SiO2 as catalyst. The optimal reaction conditions were screened by orthogonal test method. The yield of benzaldehyde glycol acetal can reach 79.6% under the optimum reaction conditions that benzaldehyde is 0. 2mol, molar ratio of benzaldehyde to glycol is 1.0： 1.5, the quantity of catalyst is 1.0%, the reaction time is 45min and the cyclohexane as carrying -water reagent is 12mL.