| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: method involves hydrogenation of a dinitrile with hydrogen or a hydrogen-containing gas in several steps: first distillation of a stream E0 coming from the hydrogenation medium in order to extract a head fraction E1 containing water and imines present in the medium, and a tail fraction Q1 containing hydrogenated compounds; second distillation of stream Q1 to extract a head fraction E2 containing hydrogenated compounds and a tail fraction Q2 containing compounds with a higher boiling point than that of the primary diamine; third distillation of the head fraction E2 to extract a tail fraction Q3 containing hydrogenated compounds and a head fraction E3 containing compounds with boiling point lower than that of the formed diamine; fourth distillation of the tail fraction Q3 to extract a head fraction E4 containing pure diamine, and a tail fraction Q4 containing heavy impurities. ^ EFFECT: method enables to carry out separation in third and fourth columns with minimum power consumption and high output, and reduce contamination of elements of the column filling. ^ 5 cl, 1 dwg |
