Verfahren zur Reinigung von Caprolactam,das insbesondere durch Nitrosierung von Cyclohexylverbindungen erhalten wurde

An improved process for the purification of caprolactam obtained by nitrosation of cyclohexylic compound in which chemical processes act selectively on the amide-type volatile bases present in crude caprolactam to transform them into compounds sufficiently differentiated from caprolactam to be readily removed. The crude caprolactam is treated with a halogen and an alkaline agent in presence of water which converts the amides into amines and these may be separated by known treatments e.g. with ion exchange resins. An alkali hypohalite may also be used. The temperature may be 0 deg.-70 deg.C., preferably 10 deg.-20 deg.C. The new process facilitates removal of amide-type volatile bases to give higher yields of pure caprolactam capable of polymerisation.