High-efficiency absorption of low NOX concentration in metallurgical flue gas using a three dimensional printed large-flow microstructured reactor

Zhou, Yu; Zhang, Jingxi; Baral, Ayonbala; Ju, Shaohua; Gu, Yanlong

doi:10.1016/j.arabjc.2022.103711

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…The actual contact area of the gas-liquid two-phase fluid in the microchannel in the microchannel reactor is affected by the change in the flow pattern of the mixed fluid, and the contact time (T) of the two-phase fluid in the microchannel reactor is determined by the flow rate; thus, the contact time (T) for the solution has as crucial effect on the NOx removal [47]. The longer the contact time between the gas and liquid phases in the microreaction channel, the greater the possibility of a reaction between the NO in the gas phase and the H 2 O 2 and (NH 2 ) 2 CO in the solution.…”

Section: Influence Of Inlet Flow On Nox Removal Efficiencymentioning

confidence: 99%

3D Printing Multi-Channel Large Volume Microchannel Reactor for Enhanced Removal of Low-Concentration NOx Flue Gas

Han

Zhou

et al. 2023

Processes

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Compared with conventional reactors that are designed by traditional micromachining technology, the use of 3D-printing technology to manufacture multichannel large-volume microchannel reactors as reaction equipment to remove low-concentration NOX by the wet method is simple and convenient, and the processing cost is low. The results showed that when the concentration of NO was 400 ppm, the mixed solution of (NH2)2CO mass fraction of 3% and H2O2 concentration of 0.5 mol/L was used, and the flow rates of gas and liquid were 100 mL/min, respectively, under the experimental conditions of pH = 11, solution temperature of 20 °C and 500 mL solution recycling for 20 min, the best removal effect of NOX was achieved, and the removal efficiency was 100%. When the O2 content in the flue gas was increased and the number and length of microchannels were increased, the NOX removal efficiency increased accordingly, which was conducive to the rapid and efficient reaction. The application of the microchannel reactor presents a new method for improving the air quality and reducing environmental pollution in the future.

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Section: Influence Of Inlet Flow On Nox Removal Efficiencymentioning

confidence: 99%

3D Printing Multi-Channel Large Volume Microchannel Reactor for Enhanced Removal of Low-Concentration NOx Flue Gas

Han

Zhou

et al. 2023

Processes

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“…On the other hand, wet scrubbing processes using water as absorbent liquid are very inefficient and strongly limited by the low solubility in water of nitric oxide NO which is usually the major constituent of NO x species [4,9]. To overcome this inconvenient, some reagents are added to water like sodium hypochlorite (NaClO) [12,13], potassium permanganate [3,14], sodium chlorite ( NaClO 2 ) [6,15,16] and hydrogen peroxide. Numerous experiments using aqueous mixtures of nitric acid and hydrogen peroxide as scrubbing solvents and applied in hollow fiber membrane modules were achieved [5] to test the NO x reduction in gaseous effluents.…”

Section: Introductionmentioning

confidence: 99%

Pilot-scale Validation of the Modeling of NOx Reactive Absorption Process Using Aqueous Solutions Containing Nitric Acid and Hydrogen Peroxide

Ghriss,

Ben Amor,

Jeday

et al. 2024

Period. Polytech. Chem. Eng.

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NOx are harmful pollutants emitted by many industries and must be removed before the gases are released into the atmosphere. Among the various techniques used for NOx removal, reactive absorption by hydrogen peroxide in a packed column has the advantage of being able to transform NOx into nitric acid which can be recycled and reused in the plants. This work aimed at modeling the NOx absorption by means of aqueous solutions of hydrogen peroxide and nitric acid, applied in a packed column operating under different representative conditions. The model established using the Aspen software considers the equilibrium and the kinetics of the reactions taking place both in the gas phase and in the liquid phase as well as the thermodynamic properties of the chemical (molecular and ionic) components estimated using the Electrolyte NRTL model. It allows predicting NOx absorption performances in terms of efficiency and selectivity. The model was validated by comparing simulation results with experimental ones obtained in a pilot-scale absorption column and published previously. The predicted values are in satisfactory agreement with the experimental data showing a deviation between 5 and 8%. Therefore, the model developed in this work could be advantageously used to design industrial-scale reactive NOx absorption columns.

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“…Through finite element simulation, we have studied the mixed flow state of fluids in serrated single channels and subsequently designed a serrated, multi-channel microreactor with a high flow rate. These reactors have been successfully applied in processes such as precious metal and transition metal extraction and separation, as well as nitrogen oxide removal [ 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

A New Process for Efficient Recovery of Rhodium from Spent Carbonyl Rhodium Catalyst by Microreactor

Guo,

Niu,

et al. 2023

Materials

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Triphenylphosphine acetylacetone carbonyl rhodium (ROPAC) is an important catalyst in the petrochemical industry, and its deactivated waste catalyst holds significant value for recovery. This study focuses on the existing forms of rhodium (Rh) in waste catalysts and the current status of traditional processes. A green, efficient, and continuous recovery technique was developed using a sealed stainless steel microchannel reactor. The influence of reaction temperature, reaction time, and phase ratio on the Rh recovery rate was investigated, and the process parameters were optimized using response surface methodology (RSM). The results indicate that the magnitude of the impact on the Rh recovery rate follows the order: reaction temperature > reaction time > phase ratio. The optimized process parameters were determined as follows: a reaction time of 29 min, a reaction temperature of 110 °C, and a phase ratio of 1:1, with a corresponding maximum recovery rate of Rh of 66.06%. Furthermore, secondary treatment was performed on the organic phase after primary recovery using the same process conditions, resulting in an overall Rh recovery rate of 95.6%, indicating satisfactory recovery efficiency. Moreover, the application of FTIR and ICP-OES analysis provided definitive evidence that the oxidative dissociation of the rhodium-phosphine chemical bond by H2O2 within ROPAC leads to the conversion of Rh+ into Rh3+. Subsequently, Rh forms chloroaquorhodium (III) complexes that enter the aqueous phase, enabling effective recovery of Rh.

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High-efficiency absorption of low NOX concentration in metallurgical flue gas using a three dimensional printed large-flow microstructured reactor

Cited by 5 publications

References 22 publications

3D Printing Multi-Channel Large Volume Microchannel Reactor for Enhanced Removal of Low-Concentration NOx Flue Gas

3D Printing Multi-Channel Large Volume Microchannel Reactor for Enhanced Removal of Low-Concentration NOx Flue Gas

Pilot-scale Validation of the Modeling of NOx Reactive Absorption Process Using Aqueous Solutions Containing Nitric Acid and Hydrogen Peroxide

A New Process for Efficient Recovery of Rhodium from Spent Carbonyl Rhodium Catalyst by Microreactor

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