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Anti-polymerization system and process for NVP production

An anti-polymerization and process technology, applied in the field of NVP synthesis, can solve problems such as clogging of defoamers, achieve the effect of slowing clogging, ensuring long-term stable operation and reducing consumption

Pending Publication Date: 2022-02-25
SICHUAN TIANHUA FUBANG CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of clogging of the defoaming net in the prior art scheme, the present invention provides an anti-polymerization system and process for NVP production

Method used

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  • Anti-polymerization system and process for NVP production

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Embodiment 1

[0022] The present invention provides an anti-polymerization system for NVP production, comprising an vinylation reactor 1, a degassing tank 2, a delivery pipeline 3 connected between the vinylation reactor 1 and the degassing tank 2, and a delivery pipeline for lowering the 3. A cooling system for the temperature of the internal material. The degassing tank 2 is provided with a defoaming net, and the cooling system includes a cooling device arranged on the conveying pipeline.

[0023] The vinylation reactor can use a reactor, add catalyst, 2-pyrrolidone solution and acetylene-propane mixed gas into the vinylation reactor, 2-pyrrolidone solution and acetylene will generate liquid NVP under the action of the catalyst, part of the acetylene-propane mixed gas It is converted into a dissolved state and mixed in liquid NVP to form a crude NVP product. The NVP crude product enters the degassing tank through the delivery pipeline for gas-liquid separation, so that the dissolved acety...

Embodiment 2

[0034] The present invention provides a kind of NVP production anti-polymerization process based on the above-mentioned NVP production anti-polymerization system, comprising the following steps:

[0035] S1, input the 2-pyrrolidone solution containing the catalyst and the mixed gas of acetylene propane into the vinylation reactor 1, at 150 ℃ temperature conditions and 1.37 MPa Under certain pressure conditions, 2-pyrrolidone and acetylene generate liquid NVP under the catalysis of the catalyst, and part of the mixed gas of acetylene propane is converted into a dissolved state and mixed in the liquid NVP to form a crude NVP product. The catalyst is potassium pyrrolidinate (K-PY).

[0036]S2, the liquid NVP crude product is discharged into the delivery pipeline 3, and the cooling system is used to cool the liquid NVP crude product to 100~130 ℃ , after the cooling is completed, enter the degassing tank 2, and at the same time ensure that the pressure in the degassing tank is 3...

Embodiment 3

[0040] The present invention provides a kind of NVP production anti-polymerization process based on the above-mentioned NVP production anti-polymerization system, comprising the following steps:

[0041] S1, input the 2-pyrrolidone solution containing the catalyst and the mixed gas of acetylene propane into the vinylation reactor 1, at 150 ℃ temperature conditions and 1.37 MPa Under certain pressure conditions, 2-pyrrolidone and acetylene generate liquid NVP under the catalysis of the catalyst, and part of the mixed gas of acetylene propane is converted into a dissolved state and mixed in the liquid NVP to form a crude NVP product. The catalyst is potassium pyrrolidinate (K-PY).

[0042] S2, the liquid NVP crude product is discharged into the delivery pipeline 3, and the cooling system is used to cool the liquid NVP crude product to 100~110 ℃ , after the cooling is completed, enter the degassing tank 2, and at the same time ensure that the pressure in the degassing tank is ...

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Abstract

The invention discloses an anti-polymerization system and process for NVP production, and relates to the technical field of NVP synthesis, the anti-polymerization system adopts the technical scheme that the anti-polymerization system comprises an etherification reactor, a degassing tank and a conveying pipeline connected between the etherification reactor and the degassing tank, the degassing tank is provided with a defoaming net, and the anti-polymerization system further comprises a cooling system, the cooling system comprises a cooling device arranged on the conveying pipeline; according to the technical scheme adopted by the anti-polymerization process, the anti-polymerization process comprises the following steps: S1, synthesizing NVP; S2, cooling and carrying out water-liquid separation; and S3, recycling acetylene-propane mixed gas, and carrying out rectification and purification. According to the present invention, the polymerization reaction forming speed of the NVP attached to the defoaming net is substantially reduced, the continuous operation time is increased, the production capacity is improved, and the NVP consumption, the defoaming net replacement frequency and the treatment cost after the blockage are reduced.

Description

technical field [0001] The invention relates to the technical field of NVP synthesis, in particular to an NVP production anti-polymerization system and process. Background technique [0002] N-vinylpyrrolidone (NVP) is a colorless or light yellow transparent liquid with a slight odor at room temperature, easily soluble in water and many other organic solvents, used in radiation medicine, wood flooring industry, papermaking, packaging materials , screen ink and other industries to improve the physical properties of the product, the commonly used industrial synthesis method is the acetylene method (also known as the Reppe method). [0003] The acetylene method refers to 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 to generate NVP, and then separate NVP from gas and liquid to obtain NVP with high purity. . The gas-liquid separation step is generally carried ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267
CPCC07D207/267
Inventor 刘橙何毅陈胜宇刘朝奎
Owner SICHUAN TIANHUA FUBANG CHEM IND CO LTD
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