间歇共沸精馏分离乙二醇单甲醚-水物系

Separation of 2-methoxyethanol-water mixture by batch azeotropic distillation

通过绘制乙二醇单甲醚-水-共沸剂的简捷剩余曲线,提出了以乙酸异丙酯作为间歇共沸精馏法分离乙二醇单甲醚-水物系的共沸剂。然后完成剩余曲线数据的测定实验,根据实验数据绘制乙二醇单甲醚-水-乙酸异丙酯三元物系的剩余曲线图,确定了乙二醇单甲醚-水共沸物系的分离工艺。并通过实验研究了共沸剂加入量对乙二醇单甲醚回收率的影响,从而确定了适宜的共沸剂配比:当共沸剂与原料中水的质量比为2～2.5时,乙二醇单甲醚的一次性收率在90%以上。

According to the short-cut residue curves for the ternary system of 2-methoxyethanol-waterentrainers, isopropyl acetate was chosen as an entrainer for the separation of 2-methoxyethanol-water mixture by batch azeotropic distillation.Then the residue curve determination experiment was completed and the residue curves for the ternary system of 2-methoxyethanol-water-isopropyl acetate were plotted based on the experiment data.A batch azeotropic distillation process was proposed for the separation of 2-methoxyethanol-water mixture.The effect of the amount of entrainer on the yield of 2-methoxyethanol was studied and the proper ratio of entrainer to feed was obtained.When w（isopropyl acetate）︰w（water）=2～2.5,especially,one-time yield of 2-methoxyethanol was more than 90%.