Method for producing (epsilon) - caprolactam (CL) and (epsilon) - caprolactam

摘要

Method for producing sym - caprolactam (CL) and sym - caprolactam. The present invention relates to the field of the production of lactams from aminonitrilas and, in particular, the production of sym - caprolactam by hydrolytic cyclization of gas phase of 6 - aminocaproflitrila.A crude liquid caprolactam comprising sym - caprolactam (CL), 6 - aminocapronitrila (ACN) and water obtained from a reaction of cyclization of the gaseous phase of ACN and placed in contact with hydrogen in the presence of a hydrogenation catalyst to convert the ACN in caprolactam liquid In a gross product comprising hexamethylenediamine (HMI) and hexametilenoimina (HMI).Tetra - hid rozepina (THA) in crude caprolactam liquid is converted into HMI during this hydrogenation. The HMD and HMI have lower boiling points compared with ACN and are therefore easier to separate from the CL in the distillation operations subsequ00faentes.Was obtained, therefore, a process to produce Cl from ACN with less number of distillation stages, and with less pressure drop and temperature on the base below.