Recovery method of N-methylpyrrolidone
A technology of methylpyrrolidone and recovery method, which is applied in the direction of organic chemistry, can solve the problems of low energy consumption, high energy consumption, and low recovery rate, and achieve the goals of simplifying operation technology, reducing energy consumption, and improving recovery rate and pass rate Effect
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[0015] Example 1
[0016] Take 5000kg of NMP raw material containing 23% water and put it into the batch distillation kettle, under -0.09MPa vacuum, heat and rectify with 130℃ heat conduction oil, total reflux time 0.5h, reflux ratio control 4, carry out water removal treatment, obtain crude NMP A1 , The first step of distillation requires 5 hours; then the heat transfer oil is heated to 180°C, the total reflux time is 1h, the reflux ratio is controlled 2, and the NMP is purified by distillation to obtain NMP B1, which is required for the second step of distillation The time is 7 hours.
Example Embodiment
[0017] Example 2
[0018] Take 5000kg of NMP raw material containing 15% water and put it into the batch distillation kettle, under -0.05MPa vacuum, heat and rectify with 100℃ heat conduction oil, total reflux time 0.5h, reflux ratio control 5, carry out water removal treatment, obtain crude NMP A2 , The first step of distillation requires 9 hours; then the heat transfer oil is heated to 200℃, the total reflux time is 1h, the reflux ratio is controlled to 5, and the NMP is purified by distillation to obtain NMP B2, which is required for the second step of distillation The time is 10 hours.
Example Embodiment
[0019] Example 3
[0020] Take 5000kg of NMP raw material containing 35% water and put it into the batch distillation kettle, under -0.08MPa vacuum, heat and rectify with 160℃ heat conduction oil, total reflux time 0.5h, reflux ratio control 2, and carry out water removal treatment to obtain crude NMP A3 , The first step of distillation requires 4.5 hours; then the heat transfer oil is heated to 160℃, the total reflux time is 1h, the reflux ratio is controlled to 0.1, and the NMP is purified by distillation to obtain NMP B3, which is required for the second step of distillation The time is 12 hours.
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