Polymeric Ionic Liquids for CO2 Capture

New methods for capturing CO2  from a surprisingly efficient material.

(De Gruyter) – Carbon dioxide (CO2) in a gas stream reduces the quality and value of the product, resulting in a more corrosive gas stream, which makes transportation difficult. Suitable removal of CO2 from gas streams is therefore quite important.

Traditional methods of CO2 capture have insufficient CO2 sorption, are corrosive, have poor thermal stability, high solvent losses, and demand high energy consumption during regeneration. A new generation of potential CO2 caputring technologies has used ionic liquids (ILs) as a CO2 sorbent. ILs are liquid organic salts at temperatures <100°C. A notable disadvantage of ILs is their high viscosity, which may be fixed by choosing an appropriate cation and anion. ILs can be covalently bonded to make polymeric ionic liquids (PILs) that demonstrate an even greater CO2 capture performance.

The authors present an overview of new PILs for CO2 capture. This includes an examination of PIL synthesis and their application as membranes, absorbents, and adsorbents. The effect of PILs’ structure on CO2 capture is discussed. In addition, the thermal properties of PILs and the effect of temperature and pressure on the CO2 sorption are also detailed.

PILs CO2 capture depends on many factors, including, but not limited to, their monomers, structures, and preparation techniques. The structures and the characteristics of PILs as sorbents must be well understood through the implementation of further experiments and theoretical approaches to design PILs to be more effective as CO2 sorbents.

The authors suggest that more studies are needed to be make the efficiency of the PILs greater by determining their placement along the gas stream. Additonal research towards the degradation of PILs needs to be conducted for studying regeneration properties.

***

Edited for Content and Length by Dr. Matthew A. Hood.

The original full article can be found at De Gruyter in the journal Reviews in Chemical Engineering.

DOI: 10.1515/revce-2015-0070

Reviews in Chemical Engineering 2017, 33(2), 183-200.

 

Pin It on Pinterest