Process for the rapid cooling of gases which contain caprolactam vapor

摘要

A process for rapidly cooling gases which contain caprolactam vapor and which have been obtained by catalytic rearrangement of cyclohexanone-oxime in the gas phase in the presence of a supported catalyst containing boric acid, wherein a finely divided coolant at from 90 DEG to 200 DEG C. is fed into a cooling zone from above, gases which are at 330 DEG -400 DEG C. and contain caprolactam vapor are introduced radially at high speed through nozzle orifices over the downstream portion of the cooling zone, and are cooled to 100 DEG -200 DEG C. by thorough mixing with the finely divided coolant, and the cooled mixture is discharged.