METHOD OF PRODUCING HEXAMETHYLENE DIAMINE AND AMINOCAPRONITRILE Russian patent published in 2012 - IPC C07C211/12 C07C255/24 C07C209/48 C07C209/82 C07C209/86 C07C253/32 

FIELD: chemistry.

SUBSTANCE: method involves a step for hemihydrogenation in the presence of a strong base and a step for separating hexamethylene diamine and aminocapronitrile from the hemihydrogenation medium or hydrogenate. Hydrogenate is mixed with an acid and/or acid salt of an alkali metal or ammonia in an amount which is sufficient to maintain the relationship T defined by the formula T = [A] * n_a / [M] * n_b, in which [A] is molar concentration of the anion of the corresponding acid or acid salt, [M] is molar concentration of the cation of the corresponding base or acid salt present, n_a is the charge value of anion A, n_b is the charge value of cation M, T varies from 1.01 to 5. Further, said hydrogenate undergoes distillation to extract the head fraction of A mainly consisting of hexamethylene diamine, and a tail fraction of B consisting of aminocapronitrile, adiponitrile and high boiling point compounds.

EFFECT: method enables extraction of hexamethylene diamine from adiponitrile hemihydrogenation medium with high degree of purification, specifically very low content of tetrahydroazepine.

8 cl, 3 ex