Microdispersion of Gas or Water in an Anthraquinone Working Solution for the H₂O₂ Synthesis Process Intensification

Abstract

The Reidl−Pfleiderer process intensification for H 2 O 2 synthesis is urgently required. Microdispersion technique is becoming one of the highest promising ways, but the microdispersion rules of gas or liquid in the anthraquinone working solution have not been mentioned until now. This study employs an observation platform to investigate the microdispersion performances of hydrogen, oxygen, or water in the anthraquinone working solution to provide reliable data for developing new microchemical processes. The influence of two-phase flow rate, viscosity, and channel size on bubble size in a circular microchannel was studied. A specific surface area higher than 20 000 m 2 /m 3 was obtained when the channel size was 150 μm. A unified mathematical prediction model for the gas−liquid and liquid−liquid microdispersion was developed, and it can be used for the future practical industrial system process intensification.

A general neural network model co-driven by mechanism and data for the reliable design of gas–liquid T-junction microdevices

“…For the model trained by the square gas inlet dataset, data from Sheng et al 19 were used, which could examine the feasibility of the model for use under a higher viscosity conditions. For the model trained by the circular gas inlet dataset, data from Wang et al 40 were used, which would allow us to test the applicability of our model in a real system and also lay the foundations. As shown in Fig.…”

Gas–Liquid Microchemical Oxidation for Continuous Synthesis Processes: A Short Review

“…serve and analyze the dispersion characteristics of an organic-gas reaction system conveniently, Song et al developed a device for the online observation of bubble size in an actual reaction system. 23 Besides, we 24 have investigated the microdispersion behavior of an organic working solution and gas system for hydrogen peroxide preparation in a T-junction microdevice with the online observation device reported by our team 23 (Figure 1c). They developed a mathematical model to describe the bubble size.…”

“…22 (c) The observation of dispersion in working liquid-gas systems using new observation platforms. 24 (d) Membrane dispersion devices for tubular membranes. 29 (e) A membrane dispersion device for sheet membranes.…”

“…(b) Microdispersion of cyclohexaneoxygen systems in glass channels 22. (c) The observation of dispersion in working liquid-gas systems using new observation platforms 24. (d) Membrane dispersion devices for tubular membranes 29.…”

General prediction models for void fraction and specific surface area of gas–liquid microflows

“…However, we can find that 2) is proposed, and the fitting parameters are listed in Table 3. The parameter of bubble equivalent diameter is determined by the microdispersion structure and can be calculated from the existing models, such as bubble length, 40,41 bubble diameter, 42,43 and bubble generation frequency, 11,32 and the Ca number (Ca = μu L /σ) is determined based on the liquid superficial velocity (u L , the ratio of the liquid flow rate to the cross-sectional area of the channel) in the bubble flow channel. Figure 7A indicates that this new equation type for the void fraction can predict the result for the four different gas-liquid flow patterns well within ±15%.…”