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Multi-effect rectification system and method for N-methyl pyrrolidone

A technology of methylpyrrolidone and multi-effect rectification, which is applied in the field of multi-effect rectification systems of N-methylpyrrolidone, can solve the problems of unsatisfactory refining effect and high energy consumption, achieves improved energy saving, improved rectification efficiency, and achieved The effect of thermal coupling

Active Publication Date: 2020-10-16
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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  • Multi-effect rectification system and method for N-methyl pyrrolidone
  • Multi-effect rectification system and method for N-methyl pyrrolidone
  • Multi-effect rectification system and method for N-methyl pyrrolidone

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Embodiment Construction

[0066] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0067] Such as figure 1 Shown, a kind of NMP multi-effect rectification system, it comprises following device:

[0068] Negative pressure dehydration tower B1, negative pressure dehydration tower tank reboiler; NMP rectification tower B8, NMP rectification tower top condenser; and inter-effect heat exchanger B9, with material inlets 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 devices are connected as follows:

[0070] The material outlet of the bottom of the negative pressure dehydration tower B1 is connected to the material inlet of the middle part of the NMP rectification tower B8 through the reboiler of the bottom of the negative pressure dehydration tower B1, and is used to send the material stream 238...

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Abstract

The invention provides a multi-effect rectification system and method of N-methyl pyrrolidone (NMP). Through ingenious design of process conditions and devices, the technology of refining NMP by adopting a multi-effect rectification process is realized. Tower top steam of a negative pressure dehydration tower is used as a heat source to provide heat for tower bottom material flow of a NMP rectifying tower, meanwhile, the tower bottom material flow of the NMP rectifying tower is used as a cold source to condense the tower top steam, therefore heating and cooling media do not need to be additionally arranged in the process, and the energy-saving purpose is achieved.

Description

technical field [0001] The invention relates to the field of refining N-methylpyrrolidone, in particular to a multi-effect rectification system and method for N-methylpyrrolidone. Background technique [0002] N-Methylpyrrolidone (abbreviated as NMP) is a colorless transparent oily liquid with a slight amine smell, low volatility, and good thermal and chemical stability. Because NMP has good miscibility with most solvents such as water, ethanol, ether, acetone, ethyl acetate, chloroform and benzene, it is widely used in the extraction of aromatics, the purification of acetylene and olefins, and the desulfurization of syngas It is also an important industrial solvent in the production industries of lithium batteries, engineering plastics, pesticides, paints, synthetic fibers, and integrated circuits. [0003] The preparation method of NMP in the prior art mainly adopts gamma-butyrolactone (abbreviated as GBL) and monomethylamine (abbreviated as MA) to carry out synthetic rea...

Claims

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Application Information

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Patent Type & Authority Applications(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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