ABSTRACT

Esterification of isoamyl alcohol with acetic acid was studied using different ion-exchange resins, namely Amberlyst 15 dry, Amberlyst 16 wet, Amberlite 120-IR. Esterification was carried out using different esterification methods that are quite new (ohmic, ultrasonic probe, and ultrasonic bath) and the results were compared with microwave-assisted esterification (MAE). The highest isoamyl acetate yield (99%) was obtained by MAE, using a mixture of acetic acid and isoamyl alcohol (mole ratio of 1:2) after 2 h of reaction time. In this process, 2% Amberlyst 15 dry was used. MAE had the least specific energy consumption (0.42 kWh/g isoamyl acetate) and specific CO₂ emission (34 g/g isoamyl acetate). According to the images obtained by scanning electron microscopy, lower amounts of Amberlyst 15 dry beads were destroyed by MAE method compared to other esterification methods. In conclusion, MAE proved to be an economic and environmentally-friendly method for esterification of different flavoring compounds.

摘要

使用不同的离子交换树脂，即Amberlyst 15干，Amberlyst 16湿，Amberlite 120-IR，研究了异戊醇与乙酸的酯化反应。使用非常新的不同酯化方法（欧姆，超声探针和超声浴）进行酯化，并将结果与​​微波辅助酯化（MAE）进行比较。在2小时的反应时间后，使用乙酸和异戊醇的混合物（摩尔比为1：2），通过MAE获得最高的乙酸异戊酯产率（99％）。在此过程中，使用2％Amberlyst 15干粉。MAE具有最低的单位能耗（0.42 kWh / g乙酸异戊酯）和特定的CO ₂排放量（34 g / g乙酸异戊酯）。根据通过扫描电子显微镜获得的图像，与其他酯化方法相比，通过MAE方法破坏了较少量的Amberlyst 15干珠。总之，MAE被证明是一种将不同调味剂进行酯化的经济且环保的方法。