Study and optimization of process for preparing hexanediamine by hydrogenation of 6-aminocapronitrile
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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