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由于二乙氧基甲烷-乙醇-水体系形成共沸物且共沸点接近,不能用普通精馏的方法分离,本文提出采用萃取精馏分离法。从二乙氧基甲烷、乙醇、水与溶剂分子之间存在的诱导力、静电力、色散力及氢键出发,分析和对比十二类溶剂,提出选用多元醇、水、胺类、酮作为萃取精馏溶剂；通过汽液平衡釜测定有所选溶剂存在时,各组分问的相对挥发度,确定乙二醇为分离二乙氧基甲烷一乙醇的良好溶剂；而乙二醇加盐作为复合溶剂,可提高二乙氧基甲烷-乙醇的分离效果。
Since the diethoxymethane-ethanol-water system forms an azeotrope and its azeotropic point is close, it can not be separated by the ordinary distillation method. In this paper, extractive distillation separation method is proposed. Based on the existence of the inducing force, electrostatic force, dispersive force and hydrogen bonding between diethoxy methane, ethanol, water and solvent molecules, the twelve types of solvents were analyzed and compared. The choice of polyols, water, amines and ketones Extracting distillation solvent; determining the relative volatility of each component in the presence of selected solvent through vapor-liquid equilibrium kettle to determine ethylene glycol as a good solvent for separating diethoxymethane-ethanol; and ethylene glycol plus salt As a composite solvent, diethoxymethane-ethanol can be separated.