萃取提纯混合酯的工艺条件研究

Preparation of Ester Mixture from Waste Acetic Acid ——Study on Dehydration of Ester Mixture by Extraction

选择KAc溶液为萃取剂 ,研究混合酯的萃取脱水过程中萃取剂的浓度、萃取温度、萃取级数对萃取效果的影响。确定萃取操作条件为萃取液的浓度大于 65% ,萃取比为 0 .4∶1 ,萃取温度为室温 ,采用两级逆流萃取 ;选择了K2 CO3为中和剂。实验结果表明 ,盐溶液萃取可同时达到脱水脱酸的目的 ,操作方便 ,工艺稳定。

The dehydration of ester mixture by extraction process was studied. Based on the experiment, a new process for dehydrating the ester mixture with KAc as dehydrating agent and neutralizing the remained acid with K 2CO 3 as neutralizer was presented. Also, the effects of extractant concentration, extraction temperature, extraction stages and extraction ratio on extraction efficiency were discussed . It is found that the perfered extraction conditions are with extractant concentraction more than 65%, extraction ratio of 0.4∶1, extraction temperature at room temperature and two stages of extraction.