Production of N-vinylformamide

摘要

An improved process for producing N-vinylformamide including the steps of evaporating N-( alpha -substituted-ethyl)formamide or ethylidenebisformamide under reduced pressure and thermally decomposing the vapor at 150 DEG -600 DEG C., wherein the improvement comprises performing thermal decomposition by means of a pyrolysis reactor which is made up of two stages, the first being an unpacked tubular reactor constructed such that liquid flows down and the second being a packed tubular reactor, while keeping the vapor temperature at 200 DEG -400 DEG C. at the outlet of the unpacked tubular reactor and the inside temperature of the packed tubular reactor at 200 DEG -600 DEG C.