TiSiW_(12)O_(40)/TiO_2催化合成丙酸系列酯

Synthesis of Propionates by using TiSiW12O40/TiO2 as Catalyst

以固载杂多酸盐TiSiW12O40/TiO2为多相催化剂,对以乙醇、正丙醇、正丁醇、正戊醇、异戊醇和丙酸为原料合成丙酸系列酯的反应条件进行了研究.实验表明TiSiW12O40/TiO2是合成丙酸系列酯的良好催化剂.通过较系统地研究醇酸的物质的量的比、催化剂用量、反应时间诸因素对酯收率的影响,得到合成丙酸系列酯的最佳反应条件.

TiSiW12O40/TiO2 was used as catalyst for the esterification of propionic acid with ethanol, propanol, butanol, n-amyl alcohol and iso-amyl alcohol. The effects of the molar ratio of alcohol to propionic acid, the amount of the catalyst, and the reaction time on synthesizing propionates were investigated. A suitable condition for synthesizing propionates was obtained, that is, the molar ratio of alcohol to propionic acid is 1.3:1, the mass ratio of the catalyst used to the reactants 2.0 %, and the reaction time 1.0 h. Under this condition, the yield of ethyl propionate is 50.3%, n-propyl propionate 71.4%, n-butyl propionate 93.0%, n-amyl propionate 96.7% and iso-amyl propionate 76.2%.