how can we separate the mixture of alcohol salt and ether
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The present invention relates to a method for separating ethyl ether, ethyl alcohol and acid water by combining extraction and azeotropic distillation. Cyclohexane is used as an azeotropic agent for azeotropic distillation, and the method comprises: firstly, a mixed solution of ethyl alcohol, ethyl ether and acid water is separated by adopting a rectification apparatus, after separation, ethyl ether is obtained at tower top, and ethyl alcohol and acid water are obtained at tower bottom; ethyl ether and acid water at the tower bottom are introduced into a deacidification and rectification tower and separated, ethyl alcohol and water are obtained at the top of the deacidification and rectification tower, acid water is obtained at tower bottom, and the acid water is neutralized; and ethyl alcohol and water at the top of the deacidification and rectification tower are introduced into an azeotrpic distillation apparatus, cyclohexane (benzene and the like) is adopted as the azeotropic agent and circularly used in the azeotrpic distillation apparatus, the water content of ethyl alcohol can be reduced to lower than 0.2% by the azeotrpic distillation apparatus, and thus, ethyl alcohol can be returned to the raw materials for reuse. In the separation process, optimum technological conditions are adopted in all apparatuses, after separation, the water contents of ethyl ether and ethyl alcohol can be respectively reduced to lower than 1.5% and 0.2%, and thus, the requirement of circular use can be achieved.