High CO2 absorption by diamino protic ionic liquids using azolide anions

Abstract

For the first time, several low-viscosity diamino protic ionic liquids (DPILs), based on azolides as anions (pyrazolide, imidazolide and triazolide) have been synthesised, characterised and evaluated for CO₂ capture. The results reveal that these ionic liquids rapidly absorb CO₂ to more than 20% w/w pointing towards equimolar absorption.