Process for the recovery of caprolactam and an alkaline metal carbonate from distillation residues formed during the purification of caprolactam

摘要

Recovery of caprolactam and of an alkali metal carbonate from distillation residues which are obtained in the purification of caprolactam and contain caprolactam and/or oligomers and/or polymers of caprolactam, and alkali metal hydroxides, by (a) melting the distillation residues, which contain caprolactam and/or oligomers and/or polymers of caprolactam, and alkali metal hydroxides, (b) continuously removing caprolactam from the melt, (c) cooling the melt after removing caprolactam with obtainment of a residue, (d) dissolving the residue thus obtained in water and (e) subjecting the aqueous solution thus obtained to incineration with the formation of an alkali metal carbonate.