| abstract |
The present invention relates to a process for producing N-methylpyrrolidone, and more particularly to gamma-butyrolactone by dehydrogenation of 1,4-butanediol in a hydrogen atmosphere under a metal oxide solid phase catalyst. 1st process which makes; And a second step of directly introducing a gamma butyrolactone obtained in the first step without purification to dehydrate the monomethylamine under a metal oxide solid phase catalyst, wherein the high purity and high yield N-methylpyrrolidone is prepared. It is about.n n n The production process of N-methylpyrrolidone according to the present invention is a two-step continuous production process using a metal oxide catalyst and proceeds two-step reaction continuously without purification of gamma-butyrolactone, a one-step reaction product, and the final product Gamma-butyrolactone, a reaction intermediate that is difficult to separate due to small boiling point difference (about 2 ℃) from phosphorus N-methylpyrrolidone, is hardly left after the reaction and is easy to be separated and purified. There is a small advantage. |