Simulation Of Transfer And Reaction Performance For Hydrogen Peroxide By Anthraquinone Process In Monolith Reactors

The unique structure and shape of monolithic reactor gives it many advantages over traditional reactors,such as large specific surface area,low pressure drop and energy consumption,wide operation range,good mass transfer performance,high utilization efficiency and so on.Hydrogen peroxide is an important green chemical reagent,which is widely employed in the fields of medicine,military and industry.Anthraquinone method is the dominant and widely used method to produce hydrogen peroxide.In this study,the hydrodynamics,mass transfer and reaction performance of the anthraquinone hydrogen system at the microchannel of structured catalyst were simulated by computational fluid dynamics.Firstly,the two-phase flow performance of the gas-liquid in the microchannel with a diameter of 2 mm was simulated by CFD.The flow pattern and distribution pattern under different superficial gas velocity were obtained.The velocity and pressure distributions in the microchannel under Taylor flow are investigated,and the effects of the superficial gas velocity on the length of the bubble and the length of the liquid slug are calculated.Secondly,the simulation of mass transfer performance of anthraquinone working fluid and hydrogen system in a single Taylor was carried out,and the velocity field along with the concentration field distribution was obtained.The impacts of different parameters on liquid volumetric mass transfer coefficient of the cold model in Taylor flow were examined.The mass transfer coefficient increases with the increase of bubble velocity and film length,and decreases with the increase of Taylor unit length and film thickness.It turns out that microchannel with smaller diameter is more favorable for the gas liquid-mass transfer.Finally,the mass transfer and reaction performance of anthraquinone hydrogenation process in a single Taylor unit was studied.Anthraquinone hydrogenation can further enhance the gas-liquid mass transfer process,and the liquid mass transfer coefficient is 1 to 3 times of the cold model.The effects of various factors on the conversion rate of anthraquinone were investigated.The simulation results indicate that the reaction and mass transfer processes are promoted mutually.