Continuous preparation method of N-methyl pyrrolidone

The invention provides a continuous preparation method of N-methyl pyrrolidone. The method comprises the following steps: taking gamma-butyrolactone (GBL) and a methylamine (MMA) aqueous solution as raw materials, making reaction through microchannel reaction equipment under the conditions that the temperature is 380-430 DEG C and the pressure is 11-20 Mpa to generate an N-methyl pyrrolidone reaction solution, and then rectifying and separating the reaction solution to obtain a pure product of N-methyl pyrrolidone. According to the continuous preparation method of the N-methyl pyrrolidone, the retention time in the synthesis process is 1-3 min, the conversion rate of gamma-butyrolactone is greater than 99.95%, and the product selectivity is 99.9% or above. The process method has the advantages of continuous production, high product yield, high production efficiency and the like. 本发明提供了一种N-甲基吡咯烷酮的连续制备方法，该方法以γ-丁内酯(GBL)和甲胺(MMA)水溶液为原料在380-430℃温度和11-20Mpa压力条件下，通过微通道反应设备进行反应生成N-甲基吡咯烷酮反应液，然后反应液经精馏分离得到N-甲基吡咯烷酮纯品。本发明所