Novel process for synthesizing N-vinyl pyrrolidone (NVP)

A technology of vinylpyrrolidone and pyrrolidone, which is applied in the new process field of NVP synthesis of N-vinylpyrrolidone, can solve the problems of flammability and explosion of acetylene, and achieve the effects of low reaction temperature, increased heat transfer area and stable solution activity

Inactive Publication Date: 2013-09-25
GNSG ANHUI HONG SIFANG
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[0007] (2) The solubility of ac...

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  • Novel process for synthesizing N-vinyl pyrrolidone (NVP)

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Embodiment Construction

[0042] Add 1000 kg of α--pyrrolidone and 15 kg of potassium hydroxide to the preparation kettle, keep the pressure at -0.095 Mpa, raise the temperature to 110°C to make potassium pyrrolidone, and mix acetylene and nitrogen at a flow rate of 120 L / h at a pressure of 1.5 Mpa and 30°C, dissolve potassium pyrrolidone and put it into the raw material buffer tank. The material passes through the bottom of the raw material buffer tank to the feeding pump to pressurize to 1.5Mpa, and is sent to the preheater at a flow rate of 200L / h to raise the temperature to the reaction temperature of 130°C. After the heater, it is sent into the casing reactor formed by connecting 3-stage reactors with an inner diameter of ￠50 mm and a length of 60 meters in series. The reaction temperature is maintained at 180° C., and the reaction residence time is 1.5 hours. After the reaction is completed, the cooler is cooled to normal temperature, the cooled crude product enters the pressure control tank, ...

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Abstract

The invention relates to the field of synthesizing N-vinyl pyrrolidone (NVP). A novel process is provided by the invention to realize safety usage of acetylene gas during synthesizing of the N-vinyl pyrrolidone (NVP). A novel tubular type reactor is employed to stably control the reaction temperature and prevent the generation of overtemperature side reactions. Nitrogen is employed to keep the pressure of a pressure control tank, and the pressure of the tubular type reactor is stabilized by the liquid level of the pressure control tank, so as to ensure that the acetylene is subjected to a continuous liquid phase reaction in the reactor. By employing a one-level tubular type reactor or multi-level tubular type reactors in series, the synthesis conversion rate of the N-vinyl pyrrolidone can reach to 20-80%, and selectivity reach to 95%.

Description

technical field [0001] The invention relates to the field of organic synthesis, in particular to a new synthesis process of N-vinylpyrrolidone NVP. technical background [0002] Polyvinylpyrrolidone (Polyvinyl Pyrrolidone), referred to as PVP, is a non-ionic water-soluble polymer fine chemical with many excellent properties and a wide range of uses. Its molecular formula (C6H9NO)n is polymerized from vinylpyrrolidone (NVP). It is a linear polymer, which is a white resinous solid, and can also be made into a transparent aqueous solution if necessary. By controlling the degree of polymerization during the polymerization reaction, products with different molecular weights can be made, and the molecular weight of PVP is generally 20,000-80,000. It can be biodegradable, and according to different process conditions, it can produce three grades of products: medicine, food and industrial grade. [0003] α-Pyrrolidone undergoes a substitution reaction with a basic catalyst, remove...

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Application Information

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IPC IPC(8): C07D207/267
Inventor 方立贵谢中平杜鹃夏维军曹宗元朱义军刘继东范鸣
Owner GNSG ANHUI HONG SIFANG
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