Mass Transfer Correlation and Optimization of Carbon Dioxide Capture in a Microchannel Contactor: A Case of CO2-Rich Gas

Abstract

This work focused on the application of a microchannel contactor for CO2 capture using water as absorbent, especially for the application of CO2-rich gas. The influence of operating conditions (temperature, volumetric flow rate of gas and liquid, and CO2 concentration) on the absorption efficiency and the overall liquid-side volumetric mass transfer coefficient was presented in terms of the main effects and interactions based on the factorial design of experiments. It was found that 70.9% of CO2 capture was achieved under the operating conditions as follows; temperature of 50 °C, CO2 inlet fraction of 53.7%, total gas volumetric flow rate of 150 mL min−1, and adsorbent volumetric flow rate of 1 mL min−1. Outstanding performance of CO2 capture was demonstrated with the overall liquid-side volumetric mass transfer coefficient of 0.26 s−1. Further enhancing the system by using 2.2 M of monoethanolamine in water (1:1 molar ratio of MEA-to-CO2) boosted the absorption efficiency up to 88%.

Chemisorption of CO2 in a gas–liquid vortex reactor: An interphase mass transfer efficiency assessment

“…It should be noted that in the case of a NaOH‐CO 2 system for example, there are various combinations of kinetic models and models to calculate the Henry's law coefficient and diffusivity coefficient, resulting in absolute value deviations in the final calculated effective interfacial area 45 . This is also the case when determining the mass transfer coefficient, 43 or to be more specific, the liquid‐side mass transfer coefficient in this study, as CO 2 absorption is a typical process controlled by the liquid‐side resistance 37,46,47 …”

“…45 This is also the case when determining the mass transfer coefficient, 43 or to be more specific, the liquid-side mass transfer coefficient in this study, as CO 2 absorption is a typical process controlled by the liquidside resistance. 37,46,47 This work aims to provide fundamental data of the gas-liquid mass transfer parameters that can be used to assess the efficiency of the GLVR. Via chemisorption of NaOH-CO 2 , the effective specific interfacial area (a e ), and the liquid-side mass transfer coefficient (k L ) of the GLVR are determined by Danckwerts' model as explained in detail below.…”

Performance of Water-Lean Solvent for Postcombustion Carbon Dioxide Capture in a Process-Intensified Absorber: Experimental, Modeling, and Optimization Using RSM and ML

“…Under optimum operating conditions, the highest carbon dioxide uptake was 70.9%. Adding monoethanolamine to water increased the absorption efficiency by 88% . In our previous study, the authors have applied methyl diethanolamine-piperazine-methanol solvent in a microchannel to investigate the effect of operating conditions on the performance of the proposed water-lean solvent …”

“…Adding monoethanolamine to water increased the absorption efficiency by 88%. 14 In our previous study, the authors have applied methyl diethanolamine-piperazine-methanol solvent in a microchannel to investigate the effect of operating conditions on the performance of the proposed water-lean solvent. 15 Recently, Pashaei et al have applied artificial neural network (ANN) and response surface methodology (RSM) methods for modeling of postcombustion carbon capture process using alkanolamine solvent to recognize the process variables and optimal conditions.…”

“…2(14) Figure2compares removal efficiencies for experimental data and model predictions. According to the predicted values of R 2 and adjusted R 2 , there is a good correlation between the model prediction and the experimental data.…”