To separate two liquids that have formed a solution, distillation would be an appropriate process, provided that the liquids have different boiling points. Distillation involves heating the solution to vaporize the liquid with the lower boiling point, and then cooling the vapor to collect it as a separate liquid.
If the two liquids form an emulsion or have similar boiling points, other methods such as centrifugation or liquid-liquid extraction might be required, depending on the specific properties of the liquids involved.