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
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[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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