A kind of multi-effect rectification system and method of n-methylpyrrolidone
A multi-effect rectification and rectification technology, which is applied in the field of N-methylpyrrolidone multi-effect rectification system, can solve the problems of unsatisfactory refining effect and high energy consumption, so as to improve energy saving, rectification efficiency, and heat coupling effect
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[0066] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0067] like image 3 As shown, an NMP multi-effect rectification system includes the following device:
[0068] Negative pressure dewatering tower B1, negative pressure dehydrated tower reboiler; NMP rectification tower B8, NMP rectification tower top condenser; and effect heat exchanger B9, material imports 1 and 2 and material outlet 1 And 2; gas-liquid separation devices B14 and B11 and condenser B10; gas-liquid separation device B5F; condenser B2e and condenser B4E.
[0069] The above device is connected as follows:
[0070] The tower of the negative pressure dewatering tower B1 is connected to the material inlet of the NMP rectification tower B8 by the negative pressure dewatering tower. NMP rectification is carried out in the middle of the NMP rectification column B8;
[0071] The tower exit of the NMP rectification tower B8 is divided into two ...
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