用环境友好催化剂俣成丙酸苄酯的研究

应用环境友好催化剂H－β沸石催化苯甲醇与丙酸的酯化反应，合成了丙酯苄酯。研究结果表明，H－β沸石 具有较高的催化活性。考察了苯甲醇／丙酸摩尔比、催化剂用量、反应温度、反应时间和带水剂环己烷用量对酯产率的影响。在典型反应条件（苯甲醇／丙酸摩尔比＝1.15:1、10.5gH－β沸石/摩尔丙酸、反应温度160℃ 、反应时间3.5h和20mL环己烷／摩尔丙酸）下，所得丙酸苄酯的产率为77％，该催化剂易于回收且可重复使用，具有良好的活性稳定性，并研究了用某些金属阳离子改性的β沸石的催化活性。

Studies on Synthesis of Benzyl Propionate Using Environmentally Friendly Catalyst

Benzyl propionate was synthesized in high yield by the esterification of benzyl alcohol with propionic acid in the presence of a new environmentally friendly catalyst, H-β zeolite. The results obtained indicate that H-β zeolite possesses a fairly high catalytic activity for the esterification reaction. The effects of benzyl alcohol/propionic acid molar ratio, the amount of H-β zeolite catalyst used, reaction temperature and time, and the amount of cyclohexane used on the yield of benzyl propionate have been investigated. The yield of the ester obtained under the typical reaction conditions (H-β zeolite/cyclohexane/benzyl alcohol/propionic acid=1.5 g/20 mL/1.15 mol/1 mol at 160 ℃ for 3.5 h) was 77%. H-β zeolite catalyst can be easily recovered, and reused after regeneration to give almost the same yield of the esterified product as that given by fresh zeolite. The catalytic activities of β zeolites modified with some cations, except for H+ ion, were also investigated.