At present,the main reason for the structural shortage of hexanediamine products lies in the limited capacity of raw material adiponitrile.In order to solve this problem,a new process route of preparing 6-aminohexonitrile by caprolactam ammoniation,replacing the key raw material adiponitrile with 6-aminohexonitrile,and using self-made nickel cobalt catalyst to synthesize hexanediamine was proposed.By adjusting the hydrogenation process parameters,it is concluded that when the reaction temperature is 75℃,the reaction time is 3h,the amount of catalyst added is 3%of the mass of 6-aminohexonitrile,the hydrogen pressure is 3.0MPa,the stirring rate is 500r·min-1,and there is no ammonia,the hydrogenation effect of 6-aminohexonitrile is the best.Through gas chromatography(GC)analysis,it is concluded that under the optimal process conditions,the conversion rate of 6-aminocapronitrile reaches 99%,the selectivity of hexanediamine reaches 99%,and the product quality of hexanediamine reaches the national standard HG/T 3937-2007 first-class product standard.The results show that the process has the advantages of simple process,high process safety,no three-wastes discharge and low equipment investment.With the expansion of domestic caprolactam capacity,the cost of this process route will be further reduced,which provides a new choice to break the long-term monopoly of foreign manufacturers on adiponitrile,the precursor material for the production of hexanediamine.
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