Separation method of organic amine impurity in N-methyl pyrrolidinone

The invention discloses a separation method of an organic amine impurity in N-methyl pyrrolidinone. The method comprises the following steps: firstly pre-processing strong acid or weak acid ion exchange fibers in different matrixes by soaking and washing; performing column-passing transformation on the pre-processed ion exchange fiber by adopting an acid solution, and flushing to neutral by deionized water, and completely draining the moisture; performing the absorption separation on the N-methyl pyrrolidinone coarse product through an ion exchange column provided with the ion exchange fiber for completely draining the moisture to obtain the high-pure N-methyl pyrrolidinone; detecting the organic amine content in the high-pure N-methyl pyrrolidinone through a potentiometric titration method; and reproducing and recycling the ion exchange fiber for absorbing the organic amine. According to the separation method provided by the invention, the quality of the NMP can be promoted to the electron and reagent standa