固体超强酸S_2O_8^(2-)/TiO_2催化合成乙酸正丁酯

Synthesis of n-butyl acetate catalyzed by solid S_2O_8^(2-)/TiO_2 superacid

以固体超强酸S2O82-/TiO2为催化剂、冰乙酸和正丁醇为原料合成乙酸正丁酯,考察反应条件对酯化率的影响。结果表明,最佳反应条件n(醇)∶n(酸)=1.4∶1,催化剂用量0.5 g(冰乙酸用量0.2 mol),过硫酸铵浓度0.75 mol.L-1,115~117℃反应1.5 h,酯化率达99%以上。催化剂可重复使用,且对设备腐蚀程度较小。

n-Butyl acetate was synthesized from acetic acid and n-butanol using S2O8^2-/TiO2superacid as the catalyst. The influences of reaction condition on the esterification rate were investigated. The results showed that the optimum condition for synthesis of n-butyl acetate using S2O8^2-/TiO2 solid superacid was as follows： 0.2 mol acetic acid, n（ acetic acid） ： n（n-butanol） = 1.0： 1.4; 0.5 g catalyst; concentration of （ NH2 ） 2 S2O8 = 0.75 mol ·L^-1 ; reaction at 115-117 ℃ for 1.5 h. Esterification rate of over 99% was attained. The catalyst can be repeatedly used with little corrosion to equipment.