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Mathematical modeling of CO 2 absorption with ionic liquids in a membrane contactor, study of absorption kinetics and influence of temperature
Author(s) -
Qazi Sohaib,
GómezComa Lucía,
Albo Jonathan,
DruonBocquet Stéphanie,
Irabien Angel,
Younas Mohammad,
SanchezMarcano José
Publication year - 2020
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6265
Subject(s) - ionic liquid , absorption (acoustics) , solubility , thermal diffusivity , membrane , chemistry , work (physics) , thermodynamics , mass transfer , hollow fiber membrane , analytical chemistry (journal) , materials science , chromatography , organic chemistry , biochemistry , physics , composite material , catalysis
BACKGROUND This work presents a comprehensive study of carbon dioxide (CO 2 ) capture from CO 2 /N 2 mixtures in a hollow fiber membrane contactor (HFMC). The absorbents considered were three different ionic liquids (ILs): 1‐ethyl‐3‐methylimidazolium acetate ([emim][OAc]), 1‐ethyl‐3‐methylimidazolium ethylsulfate ([emim][EtSO 4 ]) and 1‐ethyl‐3‐methylimidazolium methyl sulfate ([emim][MeSO 4 ]). A comprehensive two‐dimensional (2D) mathematical model for the transport of CO 2 was developed and solved for steady‐state and pseudo steady‐state modes. For pseudo steady‐state mode, the 2D model was linked with a dynamic model applied on a tank from which the IL was recirculated into the shell side of the HFMC. RESULTS The model showed excellent agreement between the simulations and experimental data within the range of 2 to 5% standard deviation. Initially, overall mass transfer coefficients of 7.6 × 10 −6 (m s −1 ), 1.6 × 10 −6 (m s −1 ) and 3.7 × 10 −6 (m s −1 ) were obtained for [emim][OAc], [emim][EtSO 4 ] and [emim][MeSO 4 ], respectively. Solubility, diffusivity and absorption efficiency of CO 2 in ILs showed strong dependence on the temperature. Furthermore, concentration drop in the wetted portion of the membrane, effect of porosity, tortuosity, gas and absorbent flow rates were systematically studied. CONCLUSION Findings of both experimental and modeling work suggests that in spite of the difference of extraction efficiency, these ILs are potential absorbents for CO 2 in membrane contactors. Moreover, the modeling approach was found very effective to predict the absorption behavior of CO 2 in ILs and to study the wetting phenomena and parametric effects. © 2019 Society of Chemical Industry