Protic ionic liquids for sustainable uses

Abstract

This review provides an overview of the current state-of-the-art and major trends in the application of protic ionic liquids (PILs) to sustainable chemistry. Following a brief description of the distinguishing...

Water‐Doped Brønsted Acidic Protic Ionic Liquids for Enhanced Tributyl Citrate Synthesis in a Two‐Phase Esterification System

“…In particular, attention is drawn to Brønsted acidic protic ILs, generated by economic acid-base reaction. [63,64] Recently we have developed a group of inexpensive highly acidic protic ILs based on sulfuric acid as highly active catalysts for the esterification of fatty acids. [62] The design of the ILs with very high molar excess of sulfuric acid compared to the amine resulted in significant cost reduction of the ILs compared to systems synthesized from equimolar acid:base ratio.…”

Ionic liquids as a shuttle for releasing and capturing hydrogen chloride: a new way to utilize waste HCl generated in organic reactions

“…Ionic liquids have been widely employed as solvent and catalyst in organic synthesis and pharmaceuticals chemistry. 18–23 Recently, more attention has been paid to waste as a resource on the basis of the unique properties of ionic liquids. 24–27 Nevertheless, there are few reports on the regeneration and reuse of waste acid in chemical reactions based on ionic liquids.…”

Superionicity by design: high proton conductivity in a fluorine-free protic ionic liquid

“…4 The ease of preparation and their high ionic conductivities 5 are at the base of the potential use of PILs in energy storage devices 3 and in sustainable chemistry. 6 In particular, some PILs have been reported to display a superionic behavior, 7–9 i.e. , their conduction mechanism is partially decoupled from the diffusion of the ionic species, thus resulting in conductivity values larger than those of electrolytes where the charge transport is purely vehicular.…”