Rectification polymerization inhibition method of N-vinylpyrrolidone (NVP)

A vinylpyrrolidone and rectification technology, applied in organic chemistry and other directions, can solve problems such as consumption loss, and achieve the effects of reducing consumption, increasing stable operation time, and improving yield

Inactive Publication Date: 2013-04-03
GNSG ANHUI HONG SIFANG
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0002] The existing N-vinylpyrrolidone rectification is purified by heating and vacuum distillation. Since N-vinylpyrrolidone is very easy to polymerize, it is confirmed that N-vinylpyrrolidone (NVP) is heated for 6 hours without adding a polymerization inhibitor. After rectification, more than 13% of the material will be polymerized, so if N-vinylpyrrolidone is used for distillation without adding a polymerization inhibitor, the consumption loss will increase as the heating time prolongs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Weigh 260g of NVP crude product and rectify it by adding 0.125g of polymerization inhibitor piperidine oxide. The specific steps are as follows:

[0018] (1) First, add 0.125g of polymerization inhibitor piperidine oxide to a dissolving tank containing a small amount of crude N-vinylpyrrolidone for stirring and dissolving;

[0019] (2) Pass the dissolved crude N-vinylpyrrolidone containing polymerization inhibitor through a metering tank, and add it to the crude N-vinylpyrrolidone (260g in total) to be rectified quantitatively by continuous dripping, and mix thoroughly;

[0020] (3) Pump the mixed materials into the rectification tower for conventional rectification, heat the rectification tower to 130°C for rectification for 6 hours, collect the refined products after rectification, the weight of the refined products obtained is 252g, and the distillation yield 96.8%.

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PUM

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Abstract

The invention provides a rectification polymerization inhibition method of N-vinylpyrrolidone (NVP). A polymerization inhibitor is stirred to be dissolved in a dissolving tank filled with a small amount of NVP crude product; and the dissolved NVP crude product containing polymerization inhibitor is quantitatively added into a rectification material via a metering tank in a continuous and dropwise addition mode or one-step mode, thereby ensuring the sufficient amount of the polymerization inhibitor in the rectification material and having the function of preventing NVP from polymerization. The method provided by the invention has the advantages of simple technique and higher product yield, reduces the waste residues, enhances the production efficiency, lowers the production cost, and also lowers the environmental pollution.

Description

technical field [0001] The invention relates to the field of organic matter purification, in particular to a polymerization inhibition method for N-vinylpyrrolidone rectification. Background technique [0002] The existing N-vinylpyrrolidone rectification is purified by heating and vacuum distillation. Since N-vinylpyrrolidone is very easy to polymerize, it is confirmed that N-vinylpyrrolidone (NVP) is heated for 6 hours without adding a polymerization inhibitor. After the rectification, more than 13% of the material will be polymerized, so the use of N-vinylpyrrolidone without a polymerization inhibitor for rectification will result in increasing consumption loss as the heating time prolongs. Contents of the invention [0003] The invention provides a polymerization inhibition method for N-vinylpyrrolidone rectification. In the N-vinylpyrrolidone rectification process, a polymerization inhibitor is added to prevent the occurrence of N-vinylpyrrolidone polymerization reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267
Inventor 方立贵谢中平杜鹃刘继东王世宏朱义军罗守元曹宗元
Owner GNSG ANHUI HONG SIFANG
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