Process for the recovery of {68 -caprolactam from a reaction mixture of {68 -caprolactam and sulfuric acid

摘要

An improvement of processes for the recovery of epsilon -caprolactam wherein a neutralized sulfuric acid is subjected to thermal decomposition, forming a gaseous mixture of ammonia and sulfur dioxide which is thereafter converted to an aqueous solution of ammonium sulfite and/or ammonium hydrogen sulfite which is then used for neutralization of the reaction mixture of lactam and sulfuric acid.