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Method for producing n-vinyl pyrrolidone

A technology of vinylpyrrolidone and pyrrolidone, which is applied in the fields of fine chemical industry and chemical pharmacy, can solve the problems of high production process cost, high cost, large dosage, etc., and achieve the effect of shortening reaction time, low price and improving conversion rate

Inactive Publication Date: 2013-05-15
JIAOZUO ZHONGWEI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the cost of the co-catalyst used in the traditional production of vinylpyrrolidone (NVP) is high due to its high price and large amount, which increases the cost of the entire production process. Catalyst, which effectively solves the problem that the cost of the entire production process is increased due to the high price and large amount of co-catalyst

Method used

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  • Method for producing n-vinyl pyrrolidone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. Add 104ga-pyrrolidone and 2g potassium hydroxide into the potassium salt reactor and heat under reduced pressure, keep 110°C for full reaction, stop heating when the water content of the distilled liquid is less than 0.05%,

[0019] B, add 1.06g diethylene glycol dimethyl ether in the potassium salt storage tank, put into the storage tank after stirring and mixing;

[0020] c. Pass the mixed gas of acetylene and nitrogen with a volume ratio of 8:2 into the high-pressure reactor, and at the same time pump the mixed solution of a-p potassium salt, a-p and diglyme ether prepared above into the high-pressure reactor to control The temperature is 130°C-150°C, the pressure is controlled at 12 atmospheres, and the reaction is carried out for 3 hours. The reacted mixed liquid is distilled to separate the unreacted a-p and NVP, and the distilled NVP is collected and then rectified to obtain the target product vinylpyrrolidone. (NVP).

[0021] The conversion rate was detected...

example 2

[0023] a. Add 260ga-pyrrolidone and 5g potassium hydroxide into the potassium salt reactor and heat under reduced pressure, keep 110°C for full reaction, and stop heating when the moisture in the distilled liquid is less than 0.05%;

[0024] b. Add 2.65g of diethylene glycol dimethyl ether, stir and mix evenly, and then put it into the storage tank;

[0025] c. The mixed gas of acetylene and nitrogen with a volume ratio of 8:2 is passed into the high-pressure reactor, and at the same time, the mixture of a-p potassium salt, a-p and diethylene glycol dimethyl ether prepared above is pumped into the high-pressure reactor to control the temperature React at 130°C to 150°C with pressure controlled at 12 atmospheres for 3 hours, distill the reacted mixed liquid to separate unreacted a-p and NVP, collect the distilled NVP and rectify to obtain the target product vinylpyrrolidone ( NVP).

[0026] The conversion rate was detected to be 88.9%, and the yield of the target product NVP w...

example 3

[0028] a. Add 1040ga-pyrrolidone and 20g potassium hydroxide into the potassium salt reactor and heat under reduced pressure, keep 110°C for full reaction, and stop heating when the moisture in the distilled liquid is less than 0.05%;

[0029] b. Add 10.6g of diethylene glycol dimethyl ether, stir and mix evenly and put it into the storage tank;

[0030] c. Pass the mixed gas of acetylene and nitrogen with a volume ratio of 8:2 into the high-pressure reactor, and at the same time pump the mixed solution of a-p potassium salt, a-p and diglyme ether prepared above into the high-pressure reactor to control The temperature is 130°C-150°C, the pressure is controlled at 12 atmospheres, and the reaction is carried out for 3 hours. The reacted mixed liquid is distilled to separate the unreacted a-p and NVP, and the distilled NVP is collected and then rectified to obtain the target product vinylpyrrolidone. (NVP).

[0031] The conversion rate was detected to be 88.7%, and the yield of...

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Abstract

The invention discloses a method for producing n-vinyl pyrrolidone (NVP). With the adoption of diethylene glycol dimethyl ether as a catalyst, not only are the effects of a convectional catalyst of reducing the reaction temperature, shortening the reaction time, improving the conversion rate, inhibiting the side reaction and improving the product yield achieved, but also the cost for producing NVP is effectively lowered because the price of diethylene glycol dimethyl ether is lower than the conventional catalyst, so that the method is more beneficial for industrial production.

Description

technical field [0001] The invention relates to a method for producing vinylpyrrolidone, which belongs to the fields of fine chemical industry and chemical pharmacy. Background technique [0002] With the continuous progress and development of science and technology, various emerging industries have greatly promoted the related varieties of PVP series products in recent years. In the future, PVP series products will be more widely used in new fields, such as new pharmaceutical products fields, environmental protection water treatment fields, biosensors, new special coatings fields, brewing and beverage fields, energy mining fields, printing industry applications and breeding fields, etc., will have a large demand support for PVP products, and the market demand will increase in the next few years. With a growth rate of 10%, the market prospect is broad. The amount of monomer vinylpyrrolidone (NVP) used as a synthetic PVP product is also correspondingly increasing significant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267B01J31/02
Inventor 赵铁段为
Owner JIAOZUO ZHONGWEI CHEM
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