Selection and characterization of ionic liquids for the potential recovery of dimethyl carbonate from methanol/dimethyl carbonate by pervaporation

Xu, Xiao;Molina Fernandez, Cristhian;Luis Alconero, Patricia
(2021) the 8th MSA Early Career Researcher Membrane Symposium 2021 — Location: Australia (25.November.2021)

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The use of pervaporation to separate organic-organic mixtures has attracted increasing interest in the research community, as the technology exhibits great potential (considering its low energy consumption) [1]. For example, valorisation of CO2 as a platform molecule to produce dimethyl carbonate (DMC) is of utmost interest, but it involves the reaction of CO2 with methanol (MeOH) to produce DMC [2-4]. This reaction is limited by the equilibrium and an azeotrope between dimethyl carbonate and methanol is also present. Thus, the low yield and high separation costs using conventional technology make this process uninteresting for a real application. In the past few years, ionic liquids (ILs) have received more and more attention as catalysts for the synthesis of DMC from CO2 and MeOH, considering their wide liquid range and excellent thermal and chemical stability[5]. Besides being used as catalysts, ILs have also showed potential in pervaporation separation. In order to screen out ILs suitable for extracting dimethyl carbonate (DMC) from a mixture of DMC/methanol (MeOH), three kinds of ionic liquids (ILs) 1-Octyl-3-methylimidazolium bromide [1O3MIm][Br], 1-Octyl-1,4-diazabicyclo[2.2.2]octanium bromide [ODABCO][Br], and 1-Octyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [1O3MIm][Br] were successfully synthesized and their chemical structures were confirmed by NMR. These three ILs and one commercial IL Tetrabutylammonium bromide [TBA][Br] were further characterised by DSC/TGA and processed into supported ionic liquid membranes (SILMs). SILMs shows a decrease in MeOH permeance almost without compromising DMC permeance and higher ideal DMC/MeOH selectivity at low temperature compared to PAN.
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Xu, X., Molina Fernandez, C., & Luis Alconero, P. (2021). Selection and characterization of ionic liquids for the potential recovery of dimethyl carbonate from methanol/dimethyl carbonate by pervaporation. the 8th MSA Early Career Researcher Membrane Symposium 2021, Australia. https://hdl.handle.net/2078.5/103109