FIELD: chemistry.
SUBSTANCE: invention relates to an improved method of producing hexamethylene diamine hydrogenation adiponitrile in liquid phase, which includes supply of hydrogen and adiponitrile in reactor containing a Raney catalyst, water and inorganic base for forming reaction medium; mixing reaction medium to provide uniform adiponitrile concentration in reactor and hydrogenation of adiponitrile for producing hexamethylene diamine. Method is characterised by that flow of reaction medium including catalyst is continuously removed from reactor and fed into flushing device (14), wherein said flow passes through device in preset direction, and water is continuously fed into flushing device and its counterflow relative to said reaction medium. Water-rich solution containing hexamethylene diamine and an inorganic base obtained flushing catalyst is continuously fed into first reservoir (18); raw hexamethylene diamine, extracted from hydrogenation reactor is continuously fed into said first container (18) and mixed with said rich in water solution at ratio of flow rate to obtain a common composition of mixture in form of a homogeneous hexamethylene diamine-rich mixture which includes at least 75 wt% hexamethylene diamine. Phase separation takes place in second container (20) between first phase, consisting of water-based solution containing essentially all inorganic base, and second phase consisting of a solution of water-hexamethylene diamine. Suspension in water of washed catalyst is continuously removed from flushing device (14), directed into a settling tank (21) and after separation of water part of regenerated catalyst is fed back into hydrogenation reactor, while not supplied back to reactor is compensated by adding fresh catalyst. Invention also relates to a device for producing hexamethylene diamine.
EFFECT: method minimises amount of water used for washing, increases amount of catalyst per unit time extracted from reactor and enables to achieve complete extraction of hexamethylene diamine, as well as possibility of controlling ratio of various flows to improve separation of alkali from solution from washing step.
19 cl, 2 dwg, 2 tbl, 12 ex
