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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

Active Publication Date: 2022-02-11
BINZHOU YUNENG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the refining effect of this technology is not ideal, and at the same time, there is still the problem of high energy consumption

Method used

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  • A kind of multi-effect rectification system and method of n-methylpyrrolidone
  • A kind of multi-effect rectification system and method of n-methylpyrrolidone
  • A kind of multi-effect rectification system and method of n-methylpyrrolidone

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Embodiment Construction

[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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Abstract

The invention provides a multi-effect rectification system and method for N-methylpyrrolidone (NMP). The system realizes the technology of refining NMP by adopting multi-effect rectification process through ingenious design of process conditions and devices. Provide heat to the bottom stream of the NMP rectification tower by using the top steam of the negative pressure dehydration tower as a heat source, and at the same time use the bottom stream of the NMP rectification tower as a cold source to condense the top steam, so that there is no need for external heating in the middle And cooling medium, so as to achieve the purpose of energy saving.

Description

Technical field [0001] The present invention relates to the field of purifying N- methylpyrrolidone, and particularly to a system and method for a multi-effect distillation N- methyl pyrrolidone. Background technique [0002] N- methylpyrrolidone (abbreviated as NMP) as a colorless transparent oily liquid with amine odor, low volatility, thermal stability, chemical stability are good. Since most of the NMP solvent such as water, alcohol, ether, acetone, ethyl acetate, chloroform and benzene have good mutual solubility, and therefore is widely used as aromatics extraction, purified acetylene and an olefin, and synthesis gas desulfurization process important industrial solvents in the production of industrial extraction agent, but also lithium, plastics, pesticides, paints, synthetic fibers, and other integrated circuits. [0003] NMP was prepared in the prior art, mainly γ- butyrolactone (abbreviated as GBL) and monomethylamine (abbreviated as MA) synthesis reaction in the absence...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D207/267B01D3/14B01D3/32B01D3/00
CPCC07D207/267B01D3/146B01D3/007B01D3/322Y02P20/50Y02P20/10
Inventor 宋彦磊郭小俊吴兴龙肖长松李金龙
Owner BINZHOU YUNENG CHEM
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