Process for the synthesis of N, N-dimethyl-1,3-diaminopropanes (DMAPA)

Procedure for obtaining an industrial scale of a diamine starting from an alkenyl nitrile corresponding, containing at least one CC double bond, comprising the steps (a) reacting alkenyl nitrile in a first reactor with a corresponding monoamine low exothermic addition monoamine al least one double bond into aminoalkyl nitrile, preparing monoamine and water, and adding the alkenyl nitrile; (B) evaporating unreacted alkenyl nitrile and monoamine to the aminoalkyl nitrile product concentration in the tail of the first reactor; (C) conversion of aminoalkyl nitrile bottom product of step (b) in a second reactor; (D) hydrogenated catalytic batch of aminoalkyl nitrile transformed in step (c) to give the diamine in the second reactor, arranged for each load a catalyst suitable for the hydrogenation of nitriles to amines and water, the desired diamine and a base , feeding the second reactor with hydrogen, and adding the aminoalkyl nitrile metered transformed in step (c); and (e) obtaining the diamine, and optionally repeating steps (a) to (e).