Purification method of N-methyl pyrrolidone
The technology of a methyl pyrrolidone and a purification method is applied in the production field of heterocyclic compounds, and can solve the problems of low purity and yield of N-methyl pyrrolidone, and achieve the effects of strong selectivity, strong solubility and high boiling point
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[0007] The invention is to add the strong alkali and weak sodium salt of the water blocking agent to the crude product at 0.1-2% of the crude product, and then continuously feed it into the three-tower rectification system of the deamination tower, the dehydration tower, and the product tower. The high-quality Packing, three-column continuous vacuum distillation, the pressure is controlled between -80 to -95kPa, the advanced distillation operation method is adopted according to the principle of optimal reflux separation effect, and the reflux ratio of 1.5-3 is used for product extraction, which effectively controls The content of impurities such as metal ions improves the yield and purity of the product; the content of impurities such as metal ions is effectively controlled. The product purity is ≥99.9%, the moisture content is ≤100ppm, and the yield of N-methylpyrrolidone is more than 99%.
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