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Synthesis process and synthesis system of N-vinylpyrrolidone, and application thereof

The technology of vinylpyrrolidone and pyrrolidone is applied in the field of synthesis process and synthesis system of N-vinylpyrrolidone, which can solve problems such as long reaction time, improve safety, shorten reaction time, and strengthen gas-liquid mass transfer and heat transfer. Effect

Inactive Publication Date: 2020-04-21
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the current new reactor has improved the safety of acetylene use and accelerated gas-liquid mass transfer to a certain extent, the reaction time is still long (1.5h), and the safety of acetylene still needs to be considered during industrial scale-up.

Method used

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  • Synthesis process and synthesis system of N-vinylpyrrolidone, and application thereof
  • Synthesis process and synthesis system of N-vinylpyrrolidone, and application thereof
  • Synthesis process and synthesis system of N-vinylpyrrolidone, and application thereof

Examples

Experimental program
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Embodiment approach

[0067] As an optional embodiment of the present invention, the synthesis process of N-vinylpyrrolidone comprises the following steps:

[0068] Provide mixed gas A of nitrogen and acetylene and 2-pyrrolidone solution containing catalyst;

[0069] Mix the mixed gas A with the 2-pyrrolidone solution containing the catalyst, then preheat the obtained gas-liquid mixture B, and then pass the gas-liquid mixture B into the microchannel reactor to make the 2-pyrrolidone and acetylene in the gas-liquid mixture B The reaction occurs and the resulting reaction mixture is isolated to give N-vinylpyrrolidone.

[0070] Mix the mixed gas A with the 2-pyrrolidone solution containing the catalyst, and then preheat the obtained gas-liquid mixture. The main purpose is that the gas-liquid mixture reaches a certain temperature, which is beneficial to the subsequent reaction in the microchannel reactor.

[0071] By further restricting the synthesis process of N-vinylpyrrolidone, the selectivity of ...

Embodiment 1

[0126] The present embodiment provides a kind of synthetic technique of N-vinylpyrrolidone, comprises the following steps:

[0127] (a) 0.6kg potassium hydroxide and 20kg 2-pyrrolidone are placed in the reaction device and carried out underpressure distillation, keep pressure 20mbar, temperature 120 ℃, finish after reaction 2h, obtain the 2-pyrrolidone solution containing catalyst (potassium pyrrolidone), Wherein the water content is lower than 500ppm;

[0128] Mix acetylene and nitrogen with a flow ratio of 1:1 to obtain a mixed gas A;

[0129] (b) Mix the mixed gas A with the 2-pyrrolidone solution containing the catalyst to obtain a gas-liquid mixture; wherein, the flow rate of the mixed gas A is 0.67Nm 3 / h, the flow rate of the 2-pyrrolidone solution containing the catalyst is 1.11L / h, and the gas-liquid volume flow ratio of the mixed gas A and the 2-pyrrolidone solution containing the catalyst is 600:1;

[0130] Preheat the gas-liquid mixture B to 130°C, and then trans...

Embodiment 2

[0135]This example provides a synthesis process of N-vinylpyrrolidone, and the specific process steps and related parameters are the same as those in Example 1.

[0136] In the microchannel reactor in this embodiment, except that the inlet and outlet in the single channel are respectively provided with a cylindrical inner member with a length of 5 cm and an outer diameter of 2 mm, the cylindrical inner member is provided with a through hole, and the cross-sectional structure of the inner member is as follows Figure 4 Shown, all the other structures are identical with the microchannel reactor structure among the embodiment 1.

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Abstract

The invention provides a synthesis process and a synthesis system of N-vinylpyrrolidone, and an application thereof, and relates to the technical field of N-vinylpyrrolidone production. The synthesisprocess of the N-vinylpyrrolidone adopts a micro-channel reactor to synthesize the N-vinylpyrrolidone , so that the potential safety hazard of acetylene is eliminated to the greatest extent, the gas-liquid mass and heat transfer in the reaction process is enhanced, the reaction time is shortened, the selectivity of the N-vinylpyrrolidone is improved, and meanwhile, continuous production is realized. The invention further provides the synthesis system of the N-vinylpyrrolidone. The synthesis system comprises the micro-channel reactor. The invention also provides the application of the synthesisprocess of the N-vinylpyrrolidone or the synthesis system of the N-vinylpyrrolidone. In view of the advantages of the synthesis process of the N-vinylpyrrolidone or the synthesis system of the N-vinylpyrrolidone, the synthesis process of the N-vinylpyrrolidone or the synthesis system of the N-vinylpyrrolidone has a good industrial application prospect in the field of production of the N-vinylpyrrolidone.

Description

technical field [0001] The invention relates to the technical field of N-vinylpyrrolidone production, in particular to a synthesis process, synthesis system and application of N-vinylpyrrolidone. Background technique [0002] N-vinylpyrrolidone (NVP for short) is mainly used in the production of polyvinylpyrrolidone. The synthesis of NVP is a key part of the polyvinylpyrrolidone industry chain. [0003] The acetylene method (also known as the Reppe method) is currently the main process for producing NVP in industry. The acetylene method refers to the generation of NVP through the affinity addition reaction of acetylene and 2-pyrrolidone at a certain temperature and pressure with a strong base such as pyrrolidone potassium as a catalyst. From the early academic research to the current mature industrial production, the synthesis of NVP is generally carried out in an autoclave. However, there are still some problems to be solved in autoclave production. First, the reaction i...

Claims

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Application Information

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IPC IPC(8): C07D207/267B01J19/00
CPCB01J19/0093C07D207/267
Inventor 程易阎丽芳付哲
Owner TSINGHUA UNIV
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