CO2 capture with room temperature ionic liquids; coupled absorption/desorption and single module absorption in membrane contactor

Qazi Sohaib , Jose Manuel Vadillo , Lucía Gómez-Coma (1) , Jonathan Albo (1) , Stéphanie Druon-Bocquet (2) , Angel Irabien (1) , José Sanchez-Marcano (2, 3)

1 Universidad de Cantabria [Santander]
2 IEM - Institut Européen des membranes
3 UM - Université de Montpellier

A membrane gas CO2 capture setup, based on the concept of single module absorption and single cycle coupled absorption/desorption, was developed in this work. Ionic liquids (ILs) 1-ethyl-3-methylimidazolium methylsulfate ([emim][MS]) and 1-ethyl-3-methylimidazolium dicyanamide ([emim][DCA]) were used as absorbents. The CO2 absorption rate decreased initially and reached to a nearly constant value achieving pseudo steady state. Coupled absorption/desorption revealed very high performance by retaining 82% and 66% absorption efficiency, for [emim][MS] and [emim][DCA], respectively, even after 70 minutes of operation. Mass transfer coefficients of the coupled absorption/desorption at pseudo steady state were 9 and 5 folds higher than single module absorption, for [emim][MS] and [emim][DCA], respectively. Parametric analysis for the membrane absorber outlet concentration and optimization of the parameters to achieve zero concentration at the membrane stripper outlet were studied in simulations. As a conclusion, coupled absorption/desorption in combination with ILs, can be considered very suitable for continuous post-combustion carbon capture.

Mots clés: Coupled Absorption/Desorption; Pseudo Steady State Modelling; Carbon Capture; Membrane Contactors; Imidazolium Ionic Liquids

Domaines: Génie des procédés

Qazi Sohaib, Jose Manuel Vadillo, Lucía Gómez-Coma, Jonathan Albo, Stéphanie Druon-Bocquet, et al.. CO2 capture with room temperature ionic liquids; coupled absorption/desorption and single module absorption in membrane contactor. Chemical Engineering Science, In press, 223, pp.115719. ⟨10.1016/j.ces.2020.115719⟩. ⟨hal-02930345⟩