The Catalytic Hydrogenation of Aniline in Fluidized Beds

Abstract

The hydrogenation of aniline in fluidized beds was studied.As a result of the experiments, the following conclusions were obtained:1) The reaction rate of the catalytic hydrogenation of respect to hydrogen. In the case of a large molar ratio of hydrogen to aniline , however, the reaction rate became zeroth-order with respect to aniline. 2) A good agreement was obtained between the conversion by the fluidized-bed experiment and the values calculated on the model of the contact-time distribution for low degrees of conversion. For high degrees of conversion, the deviation of the values calculated using this model from the experimental value was found to be about 10%. It was suggested that this model can well be applied to predicting the conversion for zeroth-order reaction within the limits of uncertainty given above.

Direct synthesis of cyclohexylamine from cyclohexene and NH3 over ZSM-5 catalysts: Impact of mesoporosity and acidity

“…1,2 The present industrial production for cyclohexylamine mainly adopts nitration of benzene with mixed acid (H 2 SO 4 -HNO 3 ) followed by catalytic hydrogenation of the obtained nitrobenzene and aniline under high temperature. 3,4 However, we must consider that the high yield for cyclohexylamine given in this process is achieved at the expense of the large amount of the mixed acid, which cannot be avoided by using highly toxic materials and discharging massive wastes (Scheme 1 ). 5 Meanwhile, other methods for the synthesis of cyclohexylamine were also developed over the past decades, including amination of cyclohexanol and reductive amination of cyclohexanone.…”

Insights into structure–function relationships of mesoporous H-ZSM-5 zeolite catalysts for direct amination of cyclohexene with NH3

“…1,2 The present industrial production for cyclohexylamine mainly adopts the nitration of benzene with mixed acid (H 2 SO 4 -HNO 3 ) followed by catalytic hydrogenation of the obtained nitrobenzene at high temperature. 3,4 We must consider that the high yield for cyclohexylamine given in this process, however, is achieved at the expense of the large amount of the mixed acid, which cannot be avoided by using highly toxic materials and discharging massive waste (Scheme 1). 5 Meanwhile, other synthesis methods of cyclohexylamine have also developed over the past few decades, such as the amination of cyclohexanol and reductive amination of cyclohexanone.…”