Production of xylylenediamine by continuous hydrogenation of liquid, comprises mixing device phthalodinitrile as melt/in solid form that is mixed with stream of liquid ammonia and removing additional stream as partial stream

摘要

The production of xylylene diamine by continuous hydrogenation of liquid, includes mixing device phthalodinitrile as melt/in solid form that is mixed with stream of liquid ammonia and removing additional stream as partial stream from the stream rotating around hydrogenation reactor or mixed with the streams. The mixing device is heated at 1-60[deg]C above the melting point of the phthalodinitrile. The mixture of streams is injected into the device. The liquid mixture of ammonia, phthalodinitrile and xylylene diamine is led into the stream rotating around the hydrogenation reactor. The production of xylylene diamine by continuous hydrogenation of liquid, includes mixing device phthalodinitrile as melt/in solid form that is mixed with stream of liquid ammonia and removing additional stream as partial stream from the stream rotating around hydrogenation reactor or mixed with the streams. The mixing device is heated at 1-60[deg]C above the melting point of the phthalodinitrile. The mixture of streams is injected into the device. The liquid mixture of ammonia, phthalodinitrile and xylylene diamine is led into the stream rotating around the hydrogenation reactor. The rotating stream is composed of larger than 93 wt% of liquid ammonia and xylylene diamine. The phthalodinitrile conversion in the hydrogenation reactor amount is larger than 99.5%. The mixture led into the hydrogenation reactor contains no solvent for phthalodinitrile. The stream rotating around the hydrogenation reactor contains liquid ammonia within the range of 25-90 wt%. A part of a liquid reactor discharge is led back continuously to the reactor entrance as rotating stream, constitutes 20-95 wt.% of the entire liquid reactor discharge. The weight ratio of the fresh phthalodinitrile inlet stream plus ammonia inlet stream to the stream rotating around the hydrogenation reactor lies between 0.05-5. The weight ratio of the feed back partial stream from the reactor discharge to the sum of the fresh phthalodinitrile inlet stream and ammonia inlet stream lies within the range of 2:1-10:1. The hydrogenation is accomplished at 40-150[deg] C, an absolute pressure of 100-300 bar and a manganese-doped complete cobalt catalyst. The catalyst is arranged in a tubular reactor or a bundle tube reactor as fixed bed. The hydrogenation reactor is adiabatically operated in trickle bed. The stream rotating around the hydrogenation reactor in which heat is extracted from a radiator. The hydrogenation reactor is used as a hydrogenation reactor cascade. The purification of the xylylenediamine takes place through distillation of ammonia in which light by-products collected at the top and heavy products collected at the bottom. The xylylenediamine is extracted after the distillation for further purification an organic solvent is added.