Patent ID: 8598385
Filing Date: 2013-12-03
Classification: C07C

Abstract:
1. A process for preparing at least one N-vinylcarboxamide, the method comprising: pyrolyzing a compound of formula wherein R and R in the presence of at least one solid which is a catalyst and is doped with at least one alkali metal or alkaline earth metal ion, under reduced pressure at a temperature of from 330 to 750° C.; eliminating hydrogen, cyanide; cooling an intermediate product obtained after the eliminating; separating and isolating at least one reaction product, wherein the at least one solid is arranged in a tubular reactor and treated with a solution of at least one selected from the group consisting of an alkali metal base and alkaline earth metal base at a temperature in a range from 0 to 250° C., the solution is discharged to give the catalyst, remaining solvent which adheres to the catalyst thus obtained is evaporated and the catalyst is then heated to a temperature of at least 380° C. for activation.