乙酸苄酯绿色合成新工艺的研究

 以新型离子液体N-甲基吡咯烷酮硫酸氢盐（［Hnmp］HSO₄）为催化剂，环己烷为带水剂，对乙酸苄酯的酯化反应进行了研究，重点考察了催化剂用量、反应温度、反应时间、酸醇摩尔比和带水剂等因素对乙酸苄酯产率的影响。实验结果表明，［Hnmp］HSO₄对合成乙酸苄酯有着良好的催化活性，当催化剂用量x苯甲醇)为1％，乙酸和苯甲醇的摩尔比为1.4∶1，环己烷为6 mL（与苯甲醇的摩尔比为0.56），油浴温度110 ℃反应1 h后，乙酸苄酯产率可达98%以上，且催化剂重复使用6次仍保持较高活性。实验放大10倍酯的产率为97.5％。腐蚀性实验表明，［Hnmp］HSO₄对不锈钢的腐蚀率为0.015 2 g/（m²·h）。

Study on Novel Technology for Green Synthesis of Benzyl Acetate

The esterification of benzyl alcohol and acetic acid with N-methyl pyrrolidonium hydrogen sulfate (［Hnmp］HSO₄) as a catalyst and the cyclohexane as a water-carrying agent was studied. The effects of different factors such as the amount of catalyst, reaction temperature, reaction time, molar ratio of acid to alcohol and the water-carrying agent were investigated in detail. The results showed that ［Hnmp］HSO₄ exhibited excellently catalytic activity. When the dosage of catalyst was 1% based on alcohol, the molar ratio of acetic acid to benzyl alcohols was 1.4∶1, the dosage of cyclohexane was 6 mL (the molar ratio of cyclohexane /benzyl alcohols was 0.56)，the reaction temperature was 110℃，the reaction time was 1h，the yield of benzyl acetate was over 98%. The yield of benzyl acetate was 97.5% when the experiment was 10 times magnification. The catalyst could be reused for six times without significant yield declining. The corrosive experiment showed that the corrosive ratio of stainless steel in ［Hnmp］HSO₄ was 0.015 2 g/（m²·h）