辛醛丙二醇缩醛的微波化学合成研究及其在食品香精中的应用

Study on the synthesis of octanal propylene glycol acetal by microwave irradiation

通过微波化学合成技术,以辛醛、丙二醇为初始原料,食品级柠檬酸为催化剂,合成了辛醛丙二醇缩醛,并对影响反应转化率的因素进行了研究。最优化条件为n(丙二醇)∶n(辛醛)=1.4,柠檬酸为2g/mol,辐射功率为600W,辐射时间12min。在此条件下,转化率为91.04%。结果发现,微波条件下,反应速率较传统方法有明显提高;避免了有害溶剂的使用,产物的安全性得到了保证。为工业化生产提供了一种新的合成方法,同时在耐高温食品香精中进行了应用。

Octanal propylene glycol acetal was synthesized by microwave irradiation from octanal and 1, 2- propylene glycol in the presence of citric acid. The factors that influenced the reaction under microwave heating were investigated,the yield of 91.04% was obtained on condition of 1 ,2-propylene glycol：octanal = 1.4（ mol/mol）, citric acid 2g/mol（ based on the amount of octanal）, irradiation power 600W, 12min. Meantime, its application on food was tested.