| The two synthetic methods of benzylamine were studied. Benzylamine was prepared by hydrogenation of benzaldehyde in the presence of liquid ammonia. Some factors, such as the ratio of raw materials, different catalysts and different quantities, temperature and hydrogen pressure were studied. Thereby , The optimum experiment condition for preparing benzylamine was obtained. The optimum experiment condition was that Raney nickel was in the amount of 5% on the benzaldehyde, the ration of liquid ammonia to benzaldhyde is 15:1, hydrogen pressure is 7.5MPa, temperature is 60 癈. Products were analyzed by GC/MS. The yield is 84.1%, and the product purity is 98.88%. The mechanism was discussed. Benzylamine was prepared in simple steps, friendly environment and good yield by this method. The yield is 84% and much higher than the yield(43.3%) by the traditional method of benzylchloride ammoniating with ammonia. However, the higher pressure was required by this method. So the investment of equipment will be much more because of the rigor reactive condition.Benzylamine was prepared by reacting benzylchloride and aqueous ammonia solution in the presence of benzaldhyde used as a side reaction inhibiter. The effects of the ammoniated reaction temperature, the quantity of aqueous ammonia solution, the concentration of hydrochloric acid, and the temperature of acid hydrolyze reaction were investigated. The optimum experiment condition for preparing benzylamine was obtained. The optimum experiment condition was that the ratio of ammonia to benzylchloride is 15:1, the ratio of benzaldhyde to benzylchloride is 2:1, the ammoniated reaction temperature is 50癈, the concentration of hydrochloric acid is 10%, and the temperature of acid hydrolyze reaction is 40癈. The yield is 84.1%, and the product purity is 99.87%. Benzylamine could be obtained in mild condition by this method and the yield up to 84.1% was obtained. This method is a good method for industrial. |
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