Method for preparing pyrrolidone and derivatives thereof by continuous tubular reactor

A tubular reactor, pyrrolidone technology, applied in the direction of organic chemistry, etc., can solve the problems of low utilization rate of equipment, difficult to improve production efficiency, complicated process, etc., to improve production efficiency, realize automation and continuity, and simple operation mode Effect

Inactive Publication Date: 2021-10-22
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts a vertical winding tubular reactor, uses organic amines such as γ-butyrolactone and ethanolamine as raw materials, uses water as a solvent, and has no catalyst participation, which overcomes the complex process and equipment of the batch reaction process. Defects of low utilization rate and difficulty in improving production efficiency

Method used

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  • Method for preparing pyrrolidone and derivatives thereof by continuous tubular reactor
  • Method for preparing pyrrolidone and derivatives thereof by continuous tubular reactor
  • Method for preparing pyrrolidone and derivatives thereof by continuous tubular reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0025] After mixing and stirring γ-butyrolactone, ethanolamine and solvent water, they are passed into a vertical winding tube reactor. When the reaction temperature is 270°C and the pressure is 7.7MPa, the residence time of the reaction materials in the reaction section is 4.3h , the molar ratio between γ-butyrolactone and ethanolamine is 1.08, and the amount of solvent is 1.2 times the mass of γ-butyrolactone; the reacted material is extracted from the lower end of the vertical winding tube reactor, and will be collected The obtained sample is rectified by a rectification tower and analyzed by gas chromatography to obtain N-hydroxyethylpyrrolidone; the reaction output is rectified to recover and recycle excess γ-butyrolactone.

Embodiment 2-4

[0027] Other steps are the same as in Example 1, except that the molar ratio of γ-butyrolactone:ethanolamine is changed.

[0028] The partial result of embodiment 1-4 reaction sees the following table:

[0029]

Embodiment 5-8

[0031] Other steps are the same as in Example 1, the difference is that the temperature is 275°C, the pressure is 8.0MPa, the amount of solvent is 2.2 times the mass of γ-butyrolactone, the residence time of the reaction material in the reaction section is 3.0h, and the γ-butyrolactone is adjusted. The molar ratio between butyrolactone and ethanolamine, the partial result of reaction sees the following table:

[0032]

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Abstract

The invention relates to a method for preparing pyrrolidone and derivatives thereof by a continuous tubular reactor. According to the method, a vertical winding tubular reactor is adopted, gamma-butyrolactone, ethanol amine and other organic amines are taken as raw materials, water is taken as a solvent, no catalyst participates, and the defects of complex technological process, low equipment utilization rate and difficulty in improving the production efficiency in an intermittent kettle reaction process are overcome. According to the method, automation and continuity of the production process can be achieved, meanwhile, the product selectivity is greatly improved, the technological operation is simple, and the process is convenient to regulate and control.

Description

technical field [0001] The invention relates to a method for preparing pyrrolidone and derivatives thereof, in particular to a method for preparing pyrrolidone and derivatives thereof in a continuous tubular reactor. Background technique [0002] Pyrrolidone and its derivatives have the characteristics of strong polarity, good solubility, stable chemical properties, easy recovery, non-toxic and non-corrosive. Among them, N-methylpyrrolidone can be used to recover acetylene, butadiene, pentadiene and other gases in naphtha cracking gas, blockages and attachments in chemical equipment such as washing towers and kettles, and high-concentration N -Methylpyrrolidone is also used as an ultrasonic cleaner for precision machinery and optical instruments; N-methylpyrrolidone has replaced phenol and furfural for the removal of aromatics in lubricating oil, and is also the main raw material for the production of artificial plasma and vitamin B1. N-hydroxyethylpyrrolidone (NHP) is an i...

Claims

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Application Information

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IPC IPC(8): C07D207/27C07D207/267
CPCC07D207/27C07D207/267
Inventor 王荷芳李小保蒋慧孙沛东
Owner HEBEI UNIV OF TECH
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