Rectification tower bottom liquid waste heat recycling system in methylamine rectification process

The utility model discloses a rectifying tower residue waste heat recycling system in a methylamine rectification process, and belongs to the technical field of methylamine preparation. The system comprises a first rectifying tower, a first condenser, a second rectifying tower, a third rectifying tower, a second condenser, a fourth rectifying tower and a fifth rectifying tower. The first condenser is connected with the first rectifying tower, one part of mixed liquid condensed by the first condenser returns to the first rectifying tower to be circulated, and the other part of the mixed liquid enters the second condenser arranged in front of the third rectifying tower to be used for condensing tower outlet gas of the third rectifying tower and finally returns to ammonia and TMA. And the second rectifying tower is connected with the reboiler through a liquid discharging pipeline for waste heat recovery, and then the waste heat returns to the circulation MA. The reboiler heat source from the kettle liquid of the