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硫酸根/氧化钛—氧化镧催化合成苯甲醛1,2—丙二醇缩醛

Catalytic synthesis of benzaldehyde 1,2-propanediol acetal with SO₄^2-/TiO₂-La₂O₃

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【Author】 XIA Jia~1,YANG Xiao-shan~1, WU Shun-hong~2, YANG Shui-jin~1 (1. Department of Chemistry and Environmental Engineering, Hubei Normal University, Huangshi 435002, China; 2. Huangshi No.3 High School, Huangshi 435002,China)

【机构】湖北师范学院化学与环境工程系；黄石三中；湖北师范学院化学与环境工程系湖北黄石 435002；湖北黄石 435002；湖北黄石 435002；

【摘要】以稀土改性固体超强酸SO₄^2-/TiO₂—La₂O₃为催化剂,通过苯甲醛和1,2—丙二醇反应合成了苯甲醛1,2—丙二醇缩醛,探讨了SO₄^2-/TiO₂—La₂O₃对缩醛反应的催化活性,研究了醛醇物质的量比、催化剂用量、反应时间等对产品收率的影响。实验表明,SO₄^2-/TiO₂—La₂O₃是合成苯甲醛1,2—丙二醇缩醛的良好催化剂,在n（醇）:n（醛）=2.25:1,催化剂用量为反应物料总质量的0.50％,环己烷为带水剂,反应时间50min的优化条件下,苯甲醛1,2—丙二醇缩醛的收率可达80.8％。更多还原

【Abstract】 Benzaldehyde 1,2-propanediot acetal is synthesized from benzaldehyde and 1,2-propanediol in the presence of SO（2-）/4-/TiO₂-La₂ O₃. The catalytic activity of SO（2-）/4-/TiO₂-La₂ O₃ to the atdolisation is discussed. The influences of the factors such as the ratio of 1,2-propanediol to benzaldehyde, dosage of the catalyst and the reaction time etc on the product yield are studied. The optimum conditions are: molar ratio of 1,2-pro-panediol to benzaldehyde is 2.25:1, the dosage of the catalyst is equal to 0.50% of feed stocks, cyclohexane can be used as dehydrator, and the reaction time is 50 min. The yield of the product reaches 80. 8% under the optimum conditions.更多还原