Applications of Ionic Liquids in Gas Processing

Abstract

Over the last decade ionic liquids have grown from relatively poorly understood materials to become integrated into industrial applications. These materials are, quite simply, comprised entirely of ions, and are liquid at room temperature. Given their nature, they have been described as "designer" solvents, with "tuneable" features that can be adjusted to suit the requirements of a particular process. A huge interest in using ionic liquids as an alternative medium for gas separation has become apparent because of such properties. For example, the high thermal stability of ionic liquids provide considerable potential to utilize them for CO 2 capture application. This paper investigates the potential of ionic liquids in gas processing applications. Initial screenings of the ability of ionic liquids for CO 2 separation up to 100 bar are presented.

Deep Eutectic Solvents: Physicochemical Properties and Gas Separation Applications

“…Therefore, the use of ILs for gas capture and in particular CO 2 capture has received interest in recent years because of their unique characteristics and high solubilities. 195,196 More specifically, by modification of solvent properties at room temperature through hydrogen-bond donors, IL mixtures may have great potential for efficient CO 2 absorption. 86 Deep Eutectic Solvents and Gas Solubility Studies.…”

“…Some recent works have shown that ILs are very promising alternative capture solvents, mostly for CO 2 and other toxic gases such as H 2 S and SO 2 as well. − The physical and chemical properties of ILs at various temperatures (mostly at room temperature) can be adjusted through modification of their cationic and anionic moieties, allowing them to be tailored for various applications and process needs such as making solvents, solid-state photocells, and thermal and hydraulic fluid lubricants. − Bates et al attempted to modify the cation of imidazolium-based ILs through the attachment of a primary amine moiety, which subsequently has high affinity and can capture CO 2 through carbamate formation. Therefore, the use of ILs for gas capture and in particular CO 2 capture has received interest in recent years because of their unique characteristics and high solubilities. , More specifically, by modification of solvent properties at room temperature through hydrogen-bond donors, IL mixtures may have great potential for efficient CO 2 absorption…”