Method for separating isopropanol-isopropyl acetate binary mixed solvent

The invention provides a method for separating an isopropanol-isopropyl acetate binary mixed solvent. Specifically, the method provided by the invention comprises the following steps: (a) providing a mixed solvent as a mother solution, in which the percentage content of isopropanol is W1 and the percentage content of isopropyl acetate is W2; (b) when W2 is greater than or equal to 50%, carrying out the following steps: (b1) carrying out normal-pressure rectification on the mother liquor under P1, and collecting normal-pressure azeotropic fractions; (b2) collecting normal-pressure residual fractions and a kettle bottom solution to obtain a first separation product; (b3) carrying out negative-pressure rectification on the normal-pressure azeotropic fraction under P2, and collecting a negative-pressure residual fraction and a kettle bottom solution to obtain a second separation product; or (c) when W1 is greater than or equal to 50%, carrying out the following steps: (c1) carrying out negative pressure rectifica