Solvent recovery apparatus and solvent recovery method

A solvent recovery apparatus comprising a solvent separation part comprising a water supply tank and a stripping unit capable of separating, from a mixture comprising a polymer component and a solvent, said polymer component and said solvent;

• a purification part capable of purifying the solvent recovered in said solvent separation part, which comprises a first distillation column and a second distillation column connected to each other and each having a reboiler and a condenser;
• and a piping system,
• wherein said piping system comprises a first line formed so that water from said water supply tank can be mixed with said mixture and then introduced into said stripping unit;
• a second line formed so that the solvent recovered from said solvent separation part can be introduced into said first distillation column;
• and a third line formed so that the solvent purified in said first distillation column can be introduced into said second distillation column, and
• said piping system further comprises a first heat exchange line or a second heat exchange line;
• wherein the first heat exchange line is provided with a heat exchanger in fluid communication with the condenser of the second distillation column, and said heat exchanger and said condenser of the second distillation column are installed in said first heat exchange line such that a top product of the second distillation column can be heat exchanged with water in said heat exchanger and then introduced into said condenser of the second distillation column;
• and
• wherein the second heat exchange line is provided in heat communication with the reboiler of the first distillation column and in fluid communication with the condenser of the second distillation column, and said reboiler of the first distillation column and said condenser of the second distillation column are installed in said second heat exchange line such that the top product of the second distillation column can pass through said reboiler of the distillation column and then pass through said condenser of the second distillation column.