Sol-Gel固定磷钨酸催化合成乙酸丁酯

Synthesis of Butyl Acetate Catalyzed by Phosphotungstic Acid Immobilized on Sol Gel

制备了正硅酸乙酯凝胶 (Sol- Gel)固定磷钨酸催化剂 ,催化合成乙酸丁酯 .实验表明 :Sol-Gel与磷钨酸的质量比为 15∶ 1时催化性能最高 ,在催化剂用量为总反应物质量的 5%、酸醇比为1.5∶ 1、反应温度为 10 5°C、反应时间 3.5h的条件下 ,酯产率可达 87%以上 .催化剂易与产物分离 ,重复使用 8次催化效果仍然较好 .

The phosphotungstic acid immobilized on Sol Gel were prepared and used for synthesising butyl acetate from n butyl alcohol and acetic acid.The catalysis activity was highest when mass ratio of tetraethoxysilane(TEOS) to phosphotungstic acid was 15∶1. The optimum condition of the reaction were determined: the moiar ratio of acetic acid to n butyl alcohol was 1.3∶1, the amount of catalyst was about 5 % of the mass of reactants, reaction temperature is 105 °C for 3.5 h. Under the optimum condition the yieid of esters is above 87 %. The catalyst could be easily separated from the products. Reusing of its catalysis activity is still well used for 8 times.