复合萃取精馏浓缩二乙氧基甲烷并回收乙醇的模拟及实验研究

设计了DEM和乙醇水溶液萃取分离工艺，以多元醇和水为萃取溶剂，采用对三角矩阵法对该过程进行了模拟计算及萃取实验. 实验结果表明，在板数N=35、原料与两种溶剂进料比为1:1:1时，萃取分离后，塔顶DEM含量达99.6%以上，收率达99.0%以上. 塔底所含溶剂和乙醇水溶液经再生塔处理后，可得到95%乙醇，其他馏分可循环使用. 本研究为进一步中试提供了依据.

Simulation and Extraction Experiment Study of DEM Condensation and Ethanol Recovery with Composite Extraction Tower

In this work the technological process of extractive separation with composite extraction tower was designed for the DEM-ethanol-water system. Ethylene glycol and water were selected as solvents of extraction separation,the separation results of extraction were simulated by triangle matrix,and at the same time tested. The results show that the purity of DEM at the top of extraction tower reaches 99.61%,the conversion rate of DEM reaches 99%,when the tower plate number is 35,and the ratio of water,ethanol and DEM in the solution is 1:1:1,the aqueous solution containing solvent and ethanol is treated by regenerative tower,95% ethanol is obtained at the tower bottom,other materials can be used by cycling. The results can be provided as basis for further pilot test.