Preparation method of high-conversion-rate and high-purity N-vinyl acetamide without catalyst

The invention relates to the technical field of chemical synthesis, in particular to a preparation method of high-conversion-rate and high-purity N-vinyl acetamide without a catalyst. In order to solve the problems that in the existing preparation process of N-vinyl acetamide, a catalyst is needed, acid-base neutralization is needed, and the thermal cracking temperature is too high, the invention provides a preparation method of high-conversion-rate and high-purity N-vinyl acetamide without a catalyst. According to the invention, N-vinyl acetamide is prepared by a one-pot method through a high-temperature and high-pressure method by adopting a physical means, and the conversion rate of raw materials and the purity of the N-vinyl acetamide can be realized without a catalyst; and when a pipeline reactor is selected as a reaction container, the thermal cracking temperature can be obviously reduced, the thermal cracking reaction can be completed when the temperature is 200-250 DEG C, the energy consumption is low