硅钨酸催化合成癸二酸二乙酯

研究了硅钨酸对癸二酸酯化合成癸二酸二乙酯的催化性能 ,得出最佳反应条件 :采用 1 0 .1 g癸二酸与 1 3m L无水乙醇反应 ,1 3m L苯为带水剂 ,以 0 .7g新制的硅钨酸 (或 1 .0 6g存放 48年的硅钨酸 )为催化剂 ,回流反应 3h,酯化率分别达95.81 % (或 93.0 5% )。并研究了几种催化剂的催化能力次序 :Fe Cl3 · 6H2 O≈新制的硅钨酸 >存放 48年的硅钨酸 >浓 H2 SO4 >Al Cl3 >存放 48年的磷钨酸 ,并证实了硅钨酸为该反应的良好催化剂 ,具有催化活性高、化学稳定性好 ,重复使用性能佳、无三废排放的优点。

Synthesis of Diethyl Sebacate Using Silicotungstic Acid as Catalyst

The use of silicotungstic acid as catalysis in the synthesis of diethyl sebacate from sebacic acid was studied. The best reactoin conditions were 0.1 g sebacic acid, 13 mL anhydrous ethanol, 13 mL benzene as water carrier, 0.70 g silicotungstic acid (newly made or 1.06 g silicotungstic acid left for 48 years) as catalyst, refluxing for 3 h, the yield 95.81%(or 93.05%). Other catalyst studied: FeCl 3·6H 2O≈silicotungstic acid (new produced)>silicotungstic acid (left for 48 years)>concentrated H 2SO 4>AlCl 3>tungstophosphoric acid (left for 48 years). It was proved that silicotungstic acid is a good catalyst of the reaction, with high activity、 good chemical stability, good repeatability and little waste discharged.