Back to Top
Skip to main content

Triazolide-Based Ionic Liquid Solvents for Use in CO2 Capture

Date Posted
U.S. Patent Pending


Research is active on the patent pending technology titled, "Triazolide-Based Ionic Liquids." This technology is available for licensing and/or further collaborative research from the U.S. Department of Energy’s National Energy Technology Laboratory.


Carbon capture and storage from fossil fuel-based power generation systems is a critical component of implementing strategies for reducing the rise in atmospheric CO2 concentrations. However, currently available carbon capture processes significantly reduce efficiency and increase electricity cost. More efficient and economical processes for CO2 capture are needed for these applications.

Ionic liquids (ILs) have been shown to be good candidates for CO2 capture due to inherent desirable properties such as high thermal stability, high CO2 solubility, low vapor pressure, large electrochemical window, and low environmental impact. The use of ILs as CO2 capture solvents has been limited by their synthetic complexity and high viscosity, which have prevented their application in most processes.

The current inventions describe a simplified method for the synthesis of a novel class of ILs that offers promising characteristics for use in reversible CO2 capture processes. The inventions cover a class of compounds in the IL family that are based on the triazolide chemical structure. More specifically, the synthetic approach is for the preparation of 1,2,3-triazolide-based ILs using controllable reaction pathways resulting in compounds with a wide range of properties that are produced in good yields. The new synthetic process eliminates undesirable side reactions resulting in reduced IL viscosity problems. Some of the resulting compounds have been shown to have improved properties over other IL classes, including increased CO2 solubility and thermal stability, facilitating high efficiency reversible CO2 capture in high temperature environments.

  • Method provides for a tunable synthetic process
  • ILs display reversible CO2 absorption
  • Synthesis method reduces viscosity of ionic liquids
  • Synthesized materials have good CO2 solubility and thermal stability
  • Materials can be used as solvents and in membrane applications
  • Scalable synthetic process
  • Pre- and post-combustion carbon capture
  • Potential application in other areas including battery and fuel cell manufacturing and use as an anionic polymerization catalyst

For more information Contact Us