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Continuous energy-saving NMP (N-methyl pyrrolidone) production method

A production method, monomethylamine technology, applied in the field of continuous energy-saving production of NMP (N-methylpyrrolidone), can solve the problems of low flash point of pure monomethylamine, unrecoverable waste water, low safety, etc. High efficiency, energy saving, high degree of automation, and continuous effect

Active Publication Date: 2013-10-16
BINZHOU YUNENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There is also a report that the laboratory uses GBL and pure monomethylamine to produce NMP. Since the pure monomethylamine has a low flash point, it is a flammable and explosive product, and the reaction It is also a high temperature process, this method is not safe
Water is produced during the generation of NMP, and a large amount of wastewater containing monomethylamine is produced after the reaction. However, this method cannot recycle the wastewater, resulting in waste of raw materials and higher requirements for sewage treatment.

Method used

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  • Continuous energy-saving NMP (N-methyl pyrrolidone) production method

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Embodiment 1

[0035] Controlled by DCS, including the lactone section and the alkanone section, the detailed steps are,

[0036] The lactone section: firstly, the butanediol is preheated by the tail gas of the preheating coil, heated to 80°C, and the hydrogen gas is heated from normal temperature to 160°C by using the gas phase material from the reactor through the hydrogen preheater, and then the gas phase The material passes through the butanediol heat exchanger and uses the gas phase material from the reactor to reheat the butanediol to 130°C; then enters the vaporizer in the same direction, the molar ratio of hydrogen to alcohol is 10:1, the vaporization temperature: 190°C, and the pressure: 0.06Mpa ;After the butanediol is completely vaporized, it enters the superheater and is heated by heat transfer oil. The temperature of the superheater is 210°C and the pressure is 0.06Mpa; 2 o3 ) in the presence of the reaction, the temperature of the reactor is 220 ° C, the pressure: 0.06Mpa; the ...

Embodiment 2

[0039] Controlled by DCS, including the lactone section and the alkanone section, the detailed steps are,

[0040] The lactone section: first preheat the butanediol with exhaust gas from the preheating coil and heat it to 90°C, then heat the hydrogen gas from normal temperature to 180°C with the gas phase material from the reactor through the hydrogen preheater, and then the gas phase The material passes through the butanediol heat exchanger and uses the gas phase material from the reactor to reheat the butanediol to 130°C; then enters the vaporizer in the same direction, the molar ratio of hydrogen to alcohol is 5:1, the vaporization temperature: 210°C, and the pressure: 0.09Mpa ; After the butanediol is completely vaporized, it enters the superheater and is heated by heat transfer oil. The temperature of the superheater is 230°C and the pressure is 0.09Mpa; 2 o 3 ) in the presence of the reaction, the temperature of the reactor is 250 ° C, the pressure: 0.09Mpa; the mixture...

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Abstract

The invention belongs to the field of N-methyl pyrrolidone (NMP) production and preparation technologies, particularly relates to a continuous energy-saving production method for preparing GBL (Gamma-Butyrolactone) / NMP from butanediol and specifically relates to a continuous energy-saving NMP production method. According to the production method, an adopted process only has a lactone work section and an alkane ketone work section, and qualified materials in a negative pressure tower are directly transferred to a rectification tower from the negative pressure tower through pressure difference between the negative pressure tower and the rectification tower, so that the working procedure is efficient and energy-saving, the staff ratio of the whole process is low, the degree of automation is high, the unit consumption is low, the product quality is good, and the yield is high.

Description

technical field [0001] The invention belongs to the technical field of N-methylpyrrolidone production and preparation, in particular to a continuous energy-saving production method for preparing GBL / NMP from butanediol, specifically a continuous energy-saving production method for NMP (N-methylpyrrolidone). Background technique [0002] The chemical name of GBL tar is gamma-butyrolactone (GBL). [0003] γ-butyrolactone (GBL) is an important organic chemical raw material and fine chemical intermediate. It is also a high boiling point solvent with good performance, strong solubility, good electrical properties, high stability, non-toxic and safe to use. It is widely used in petrochemical, pharmaceutical, pesticide and other fields. In the present invention, γ-butyrolactone is mainly used as an intermediate to produce N-methylpyrrolidone (NMP). [0004] The chemical name for NMP is N-methylpyrrolidone (NMP). [0005] N-Methylpyrrolidone (NMP) is a high-boiling, environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267
CPCY02P20/10
Inventor 吴兴龙徐宜彬
Owner BINZHOU YUNENG CHEM
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