METHOD OF PRODUCING PRIMARY DIAMINES Russian patent published in 2011 - IPC C07C209/48 C07C209/84 C07C211/12 

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