Rectification and purification system for NMP (N-Methyl Pyrrolidone) solution containing salt impurities

The utility model relates to the technical field of lithium battery material recovery, and discloses a rectification purification system for an NMP (N-Methyl Pyrrolidone) solution containing salt impurities, which comprises a first filter, a feeding device, a reduced pressure rectification device, a normal pressure rectification device, a second filter and a discharging device which are communicated in sequence, the vacuum rectification device comprises a vacuum rectification tower and a vacuum tower feeding pipeline, the vacuum tower feeding pipeline is connected with the vacuum rectification tower and the feeding device, a rectification section of the vacuum rectification tower is of a filler type, and a stripping section of the vacuum rectification tower is of a tower plate type; the normal-pressure rectification device comprises a normal-pressure rectification tower and a normal-pressure tower feeding pipeline, the normal-pressure tower feeding pipeline is connected with the reduced-pressure rectification