Reaction kinetics data were measured for the regeneration reaction of ethyl nitrite used for the catalytic coupling reaction of carbon monoxide in an atmospheric flowing gas -liquid reactor. The corresponding macroscopic kinetic model was established as the form RA=KpNO with activation energy of 19. 46 kJ/mol and frequency factor of 0. 341 mol/(m3 ·Pa· s). Parameter calculations were carried out with a double - film model of gas - liquid reaction. The results show that the regeneration reaction is a first order quick reaction and the reaction rate is mainly controlled by mass transfer in the liquid film. The activation energy of the intrinsic reaction is 22. 86 kJ/mol and the frequency factor is 1. 741×108s-1.