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对羟乙基吡咯烷酮（ＮＨＰ）脱水的两种不同方法——直接脱水方法与间接脱水方法进行了研究和比较，从研究结果综合考虑各方面因素可以看出，直接脱水方法优于间接脱水方法，是未来ＰＶＰ单体合成方法的发展趋势。
Two different methods of dehydration of hydroxyethylpyrrolidone (NHP) - direct dehydration method and indirect dehydration method were studied and compared. From all the factors considered in the study, it can be seen that the direct dehydration method is superior to the indirect dehydration method, Is the future development trend of PVP monomer synthesis method.