Removal of nitric oxide in a microporous tube‐in‐tube microchannel reactor by ferrous chelate solution

Abstract

NO gas emission has harmfully impacted human health and the environment. Absorption of NO gas into an aqueous solution is considered to be a promising approach for its removal. FeII(EDTA) solution has been demonstrated as an efficient option in the denitrification process. However, its absorption rate is strongly affected by mass transfer limitation of NO into FeII(EDTA) solution in traditional reactors. In this paper, the removal process of NO with FeII(EDTA) solution was studied in a microporous tube‐in‐tube microchannel reactor (MTMCR). The effects of design and operating parameters such as micropore size, annular channel width, liquid flow rate, gas flow rate, gas‐liquid ratio, pH and concentration of absorbent, and absorption temperature on overall volumetric mass transfer coefficient (KLa) and NO removal efficiency were explored. The results indicated that the MTMCR exhibited obvious advantages owing to continuous operation mode and higher NO removal efficiency of over 90 %, as compared to traditional reactors. Both KLa and NO removal efficiency increased with increases of absorbent concentration and liquid flow rate, as well as decreases of absorption temperature, micropore size, and annular channel width. In addition, KLa increased while NO removal efficiency decreased with increasing gas‐liquid ratio and gas flow rate. The obtained results imply a great potential of the MTMCR in the removal of NO from post‐combustion flue gas.

Investigation of mixing performance in a semi‐active T‐micromixer actuated by magnetic nanoparticles: Characterization via Villermaux–Dushman reaction

“…If the flow rate ratio (R) is increased (reduction of Q B ), to maintain a balanced stoichiometric ratio, the concentration of acid ([H + ] 0 ) should be increased. In other words, it needs to keep a fixed amount for n A n B in Equation (5).…”

“…[1][2][3] So, micro-technology is currently applied as a fine area for rapid development in numerous applications due to great mass transfer and efficiency of mixing, high product selectivity, safety proficiency, and lower energy usage. [4][5][6][7][8] Indeed, microreactors perform continuous chemical reactions in a micro-scale channel and provide a highly specific surface. Moreover, microreactors are normally three-dimensional configurations with an inner diameter of less than a millimetre, and reaction capacities in the nanolitre to microlitre limits.…”

FeII(EDTA)–NO Reduction by Mn Powder in Wet Flue Gas Denitrification Technology Coupled with Mn2+ Recycling: Performance, Kinetics, and Mechanism

“…He et al , reported that the reduction reaction between reducing metals and Fe II (EDTA)–NO was an endothermic process, suggesting that high temperature was beneficial to Fe II (EDTA)–NO reduction. However, according to Henry’s law, excessive temperature would reduce the solubility of NO in the absorbent solution, which may result in secondary pollution. Thus, temperature is one of the significant factors on Fe II (EDTA)–NO reduction.…”