磷钨酸/硅胶催化剂催化合成苯甲醛1,2-丙二醇缩醛

Synthesis of benzaldehyde 1,2-propanediol acetal by using H_3PW_(12)O_(40)/SG as catalyst

以自制磷钨酸/硅胶为多相催化剂,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,采用正交试验探讨了合成苯甲醛1,2-丙二醇缩醛的影响因素。实验结果表明:固定苯甲醛物质的量为0.2mol,在n(苯甲醛)∶n(1,2-丙二醇)=1∶1.6,催化剂用量为反应物料总质量的0.75%,带水剂环己烷为10 mL,反应时间30 min的条件下,苯甲醛1,2-丙二醇缩醛的收率为75.9%.

A new environmental friendly catalyst, H3 PW12O40/ SG was prepared. Benzaldehyde 1,2 -propanediol acetal was synthesized from benzaldehyde and 1,2 -propanediol by using H3 PW12O40/ SG as catalyst according to orthogonal test method. Under the reaction condition of the amount of benzaldehyde is 0.20 mol, the molar ratio of benzaldehyde to 1,2 - propanediol is 1 ： 1.6, the dosage of catalyst is equal to 0.75% of feed stocks, the volume of cyclohexane as the water - carrying agent is 10mL, and the reaction time is 30min, and yield of benzaldehyde 1,2 - propanediol acetal can reach 75.9%.