Experimental Study on Simultaneous Absorption and Desorption of CO₂, SO₂, and NO_x Using Aqueous N-Methyldiethanolamine and Dimethyl Sulfoxide Solutions

Abstract

MDEA+DMSO aqueous solutions, made up of N-methyldiethanolamine (MDEA) and dimethyl sulfoxide (DMSO), were explored for the simultaneous absorption of CO2, SO2, and NO x . Experiments in a semibatch absorption–desorption system were carried out to measure the absorption and desorption performance of aqueous MDEA+DMSO solutions. The influences of concentration proportion, MDEA/DMSO concentration, absorption temperature, desorption temperature, and cycle index on the simultaneous absorption and desorption were investigated. The experimental results indicated that under all experimental conditions the desulfurization efficiency was constant of 100% and the NO2 absorption efficiency was above 98%, whereas the absorption of CO2 and NO was significantly affected by the solution concentration and absorption temperature. The 5 mol/L MDEA + 2.5 mol/L DMSO solution exhibited optimal absorption performance with the CO2, SO2, NO, and NO2 absorption efficiency of 91.04%, 100%, 97.14%, and 100%, respectively. A semiempirical formula of CO2 absorption rate was obtained, and the optimal operating conditions were established; the reusability and stability of MDEA+DMSO solution were also verified in absorption–desorption circulation experiments. Meanwhile, the reaction mechanisms of the absorption and desorption were discussed based on the characterization of removal product by Fourier transform infrared spectroscopy and ion chromatography. Consequently, the aqueous MDEA+DMSO solution would be expected to be a renewable absorbent for simultaneous removal of CO2/SO2/NO x .

Precipitation and Transformation of Vaterite Calcium Carbonate in the Presence of Some Organic Solvents

“…It was found that methanol increased the CO 2 partitioning into the aqueous phase [33]. Additionally, it was reported that the addition of DMSO in a concentration range from 2.5 up to 3.3 M affected CO 2 absorption and increased the rate of CO 2 absorption in the presence of methyldiethanolamine [34]. However, our results obtained in the presence of ammonia did not show a rapid decrease in pH during CO 2 absorption in the DMSO solutions.…”

CO2 Absorption/Desorption in Aqueous Single and Novel Hybrid Solvents of Glycerol and Monoethanolamine in a Pilot-Scale Packed Bed Column

“…[3][4][5] One efficient method for CO 2 capture is the use of aqueous alkanolamine solutions or their mixtures. 4,6,7 Monoethanolamine, diethanolamine, and N-methyldiethanolamine 8,9 are conventional chemical absorbents. 1,4,10,11 Piperazine is commonly used as a blend with other amines because its absorption capacity for CO 2 and absorption rate 7,8 are approximately twice than those of MEA and its energy requirements are approximately 15% less than those of MEA.…”

Thermodynamic properties in ternary system of NH4HCO3–H2O–ethanol based on antisolvent method to strengthen crystallization of carbonized ammonia

“…Jiang et al (2017) and Wang et al (2016) were engaged in the research and development of high performance anhydrous oxide adsorption materials. Luo et al (2018) proposed a promising renewable absorbent for simultaneous removal of CO 2 /SO 2 /NOx, which made a foundation for following research in this field. and Wei et al (2015) were committed to the research of CO 2 capture technology for dry removal of flue gas by potassium-based absorbent.…”

“…(2016) were engaged in the research and development of high performance anhydrous oxide adsorption materials. Luo et al. (2018) proposed a promising renewable absorbent for simultaneous removal of CO 2 /SO 2 /NOx, which made a foundation for following research in this field.…”