减压蒸馏中二氯甲烷低温回收试验研究

为了减少实验室中二氯甲烷气体的直接排放,搭建了一套减压蒸馏低温回收试验装置,采用纯二氯甲烷作模拟溶剂回收试验成功后,在乙酰二茂铁制备过程中对二氯甲烷进行回收实验,回收率约90%,比模拟试验偏低;通过对比,两种试验数据规律表现一致,验证了试验方法的准确性。采用改变冷媒温度的方法,改变回收器内温度,对影响回收效果的温度因素进行分析,发现最佳冷媒温度为0℃。试验证明该系统能有效实现二氯甲烷的回收。

Experimental Study on Methylene Chloride Recycling at Low Temperature in Vacuum Distillation

In this paper,in order to reduce the gas of methylene chloride in laboratory directly discharged,a set of low temperature recovery test device in vacuum distillation was presented.Experiment adopted pure methylene chloride as simulate solvent to do recovery test successfully later,and recovery rate of methylene chloride recovery experiment in the process of acetylferrocene preparation was about 90%,lower than simulate experiment.After the contrast,two kinds of experiment data rule were mainly consistent,and proved the accuracy of the simulate experiment.The method of changing refrigerant temperature was applied to altering internal temperature of recoverer,and the temperature factor of influencing recovery effect was analyzed;the result showed that the best refrigerant temperature was 0 ℃.The experiments show that the recovery system can effectively realize the methylene chloride recovery.