磁稳定床羰基化合成碳酸二苯酯的冷模实验

Cold model experiment for magnetically stabilized bed reactor applied in synthesis of diphenyl carbonate by carbonylation method

以磁性催化剂Pd/La0.5Pb0.5MnO3为固相、N2为气相、纯水为液相在磁稳定床上进行冷模实验,探索磁稳定床的流动特性,为磁稳定床氧化羰基化合成碳酸二苯酯提供数据。考察了不同操作条件对固相催化剂在磁稳定床中流化状态的影响,并通过流体力学软件FLUENT对实验进行计算模拟。结果表明:催化剂可以在流化床中达到完全流化状态,且起始流化速度随液体流速增大、外加磁场强度的增大及分布板开孔率减小而增大,床层高度随气相流速和液相流速减小而减小,随磁场强度的减小而增大,固相分布随床层高度减小而趋于密集,在实验气相流速范围内,床层的平均气相含率与气体流速基本呈直线上升关系。FLUENT软件模拟结果与实验过程完全吻合。

Using magnetic catalyst Pd/La0.5 Pb0.5 MnO3 as solid phase,N2 as gas phase,water as liquid phase,cold model experiment was carried out in the magnetically stabilized bed.The flow characteristics were explored for providing data to oxidation carbonyl synthesis of diphenyl carbonate.The influence of different operating conditions on the fluidized state of solid phase was studied,and the fluid dynamics software FLUENT was used for computer simulating experiment.The results show that in the fluidized bed the catalyst can be completely fluidized.The initial fluidization velocity is increased with increasing liquid flow rate,magnetic field strength and with decreasing opening ratio of the distribution plate.The bed height is decreased with decreasing gas velocity and liquid velocity and increased with the decreasing of the magnetic field strength.The distribution of the solid phase tends to be dense with decreasing height of the bed.In the experimental gas flow rate range,the average gas holdup in the bed is increased linearly with gas velocity.The FLUENT software simulation results are fitted well with the experimental procedures.