Abstract
The reductive amination of cyclohexanone with ammonia over Cu-Cr-La/γ-Al2O3 was investigated. It was found that a proper solvent with high solubility of ammonia and 4A molecular sieves for the elimination of generated water contributed to the formation of cyclohexylamine in the premixing process. In addition, the addition of ammonia in the fixed- bed reactor could obviously improve the conversion of cyclohexanone to cyclohexylamine. Finally, reaction conditions includ- ing reaction temperature, hydrogen pressure and charging rate of the premix were optimized. Under the optimized conditions, cyclohexylamine was obtained in 83.06% yield.
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