System for purifying n-methyl-2-pyrrolidone, and method therefor

Abstract

The present invention relates to a system for purifying N-methyl-2-pyrrolidone, and a method therefor, and, to an NMP purification system comprising: a first module unit including a booster fan unit for collecting waste NMP gas, and a waste NMP gas adsorption unit for adsorbing the waste NMP gas and converting same into a waste NMP solution; a second module unit which is adjacent to the first module unit, and which includes a DI water supply unit for supplying DI water used for the waste NMP gas adsorption unit; a third module unit which is adjacent to the second module unit, and which includes a first purification unit for purifying, through permeation and evaporation, the waste NMP solution supplied from the first module unit; a fourth module unit which is adjacent to the third module unit, and which includes a second purification unit for purifying, through distillation, the purified NMP solution supplied from the third module unit, and a third purification unit for purifying, through distillation, the NMP solution purified in the second purification unit; and a fifth module unit which is adjacent to the fourth module unit, and which includes a fourth purification unit for purifying, through vaporization, the purified NMP solution supplied from the fourth module unit.

Dependencies are inferred from the claim text.