酸功能化聚醚离子液体催化合成乙酸松油酯的研究

制备和表征了酸功能化聚醚离子液体1-(3-磺酸)丙基-3-聚氧乙烯醚基咪唑磷酸二氢盐-［HSO₃－(CH₂)₃－im－(CH₂CH₂O)nH］H₂PO₄，并用于催化合成乙酸松油酯的反应，考察了反应时间、反应温度、原料配比和催化剂用量等因素对反应的影响。在n(松油醇)∶n(乙酸酐)=1∶1.5，松油醇5.1 g、离子液体1.5 g、反应温度40 ℃和反应时间8 h条件下，松油醇转化率超过99.5%，乙酸松油酯的选择性为87.8%；并对离子液体的重复使用性能进行了考察，表明离子液体不经处理直接重复使用6次后，松油醇的转化率为99.4％，乙酸松油酯的选择性为88.3％，具有较好的重复使用性能。

Synthesis of terpinyl acetate catalyzed by acidic functional polyether ionic liquid

An acidic functional polyether ionic liquid, 1-(3-sulfonic group)propyl-3 polyoxyethyleneimidazole dihydrogen phosphate (［HSO₃(CH₂)_3-im-(CH₂CH₂O)_nH］H₂PO₄ ), was synthesized and used to catalyze the esterification of terpineol with acetic anhydride. The effects of reaction condition,i.e.,reaction temperature, reaction time, n(terpineol)∶n(acetic anhydride) and amount of acidic functional ionic liquid, were investigated. The optimum condition for the esterification was obtained as follows: n(terpineol)∶n(acetic anhydride)＝1∶1.5,terpineol 5.1 g, ionic liquid 1.5 g, reaction temperature 40 ℃, reaction time 8 h. Terpineol conversion of over 99.5%and selectivity to terpinyl acetate of 87.8 %were obtained under the optimum condition．Recyclability of the ionic liquid was also investigated. Terpineol conversion of 99.4% and the selectivity to terpinyl acetate of 88.3% were attainable afterthe ionic liquid was used for six times.