Method for removing water from ionic liquid alcoholic solution

The invention relates to a method for removing water from an ionic liquid alcoholic solution. The method comprises the following steps: S1, adding an additive into an ionic liquid alcoholic solution for adjustment to obtain an adjusted ionic liquid alcoholic solution; S2, enabling the adjusted ionic liquid alcoholic solution to pass through a pervaporation unit to obtain a dehydrated ionic liquid alcoholic solution; and S3, heating the dehydrated ionic liquid alcoholic solution, and recovering the additive in the ionic liquid alcoholic solution. According to the method disclosed by the invention, the acidity in the system is greatly reduced by adding the additive into the acidic ionic liquid alcoholic solution, so that the system does not damage the pervaporation membrane, and the operation conditions of the conventional pervaporation membrane are met; the whole water removal process can be completed at low temperature, so that the energy consumption of the whole process is greatly reduced; and the whole proc