Investigation Of The Reaction Process For One-Step Oxidation Benzene To Phenol With Nitrous Oxide In Fixed Fluidized Bed

The influence of the operating conditions on the reaction system and the catalyst performance has been studied systematicly by a fixed fluidized bed reactor. On the basis of the reactor performance, the effects of temperature(300-500℃), benzene/nitrous molar ratio(4:1-16:1) and reaction space velocity(2500-4500h-1) on the reaction process were investigated by the single-factor test method, respectively. And based upon the results of the single-factor experiments above, the global influence of them on the oxidation reaction and product distribution was also studied by means of orthogonal test L9(34). The optimal reaction conditions were determined as follows: temperature 430□, benzene/nitrous molar ratio of 9:1, reaction space velocity 3100h-1.On the basis of the fixed fluidized bed performance investigation, the effects of regeneration temperature(350～550□), volume percentage of N2O in regeneration feed (6.25～25%) and regeneration space velocity(2500-4500h-1) on the regeneration process were investigated by the single-factor test method, And based on the results of the single-factor experiments, the global influence of them on the regeneration process was also studied by means of orthogonal test L9(34). The optimal regeneration operating conditions were determined as follows:regeneration temperature 440□, volume percentage of N2O in regeneration feed 12.50%, regeneration space velocity 3700h-1.On the basis of the reaction/regeneration process investigation, the effects of period (2-10min) and split (0.1-0.9) on the unsteady process were investigated by the single-factor test method using fixed fluidized bed reactor., respectively. And based upon the results of the single-factor experiments, the global influence of them on the oxidation reaction was also studied by means of orthogonal test L9(34). The optimal period operating conditions were determined as follows:period 6min, split 0.4.A simulation using the bubble fluidized bed reactor model to predict the performance of this reaction in an experimental fluidized bed reactor was performed. It shows that the higher reaction temperature adopt, the higher conversion of N2O we have. The contactefficiency between gas phase and solid phase was influenced by the size of bubble. The conversion of N2O will reduce by the increase of he size of bubble.