Patent ID: 7939027

Claim:
An apparatus for preparing diamines, which comprises (a) a first reactor for addition of a monoamine onto an alkenyl nitrile, which is provided with at least i) one or more separate or joined inlets for the monoamine, the alkenyl nitrile and water; ii) at least one first outlet which is suitable for discharging vapor which consists essentially of water and the monoamine from the first reactor; and iii) at least one second outlet which is suitable for discharging the aminoalkyl nitrile formed in the bottoms; (b) a second reactor for the batchwise hydrogenation of the aminoalkyl nitrile, which is provided with at least i) at least one first inlet which is connected to the second outlet of the first reactor; ii) one or more further separate or joined inlets for hydrogen, catalyst, base, water and an inert gas; and iii) an outlet for discharge of the reaction product; and (c) an apparatus for isolating the diamine from the reaction product, which is provided with at least i) at least one inlet which is connected to the outlet of the second reactor, and ii) at least one outlet which is suitable for discharging the diamine isolated, wherein the connection between the second reactor and the apparatus for isolating the diamine has a second filter.