磺化硅胶催化合成苯甲醛-1,2-丙二醇缩醛

Catalytic synthesis of benzaldehyde 1,2-propanediol acetal over sulfonated silica gel

以磺化硅胶为催化剂,苯甲醛和1,2-丙二醇为原料,合成苯甲醛-1,2-丙二醇缩醛。研究了磺化硅胶催化剂用量、原料配比和回流时间对收率的影响。最佳反应条件为:苯甲醛用量0.05 mol,n(苯甲醛):n(1,2-丙二醇)=1.0:1.5,催化剂用量0.2 g,带水剂环己烷用量8.0 mL,反应时间80 min,苯甲醛-1,2-丙二醇缩醛收率可达94.0%以上。催化剂制备简单,催化活性高,后处理简便,符合绿色环保催化剂的发展趋势。

Benzaldehyde 1,2-propanediol acetal was synthesized using sulfonated silica gel and benzaldehyde and 1,2-propanediol as the raw materials. The effects of catalyst dosage as the catalyst , molar ratio of the reactants and reaction time were investigated. Benzaldehyde 1,2-propanediol acetal yield of over 94.0% was attained under the optimal reaction condition as follows ：benzaldehyde 0.05 mol,n（ benzalde- hyde） ： n（ 1,2-propylene glycol） = 1.0： 1.5, catalyst dosage water-carrying agent cyclohexane 8.0 mL, reaction time 80 0.2 g（4.6% of the mass of benzaldehyde）, min.