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Ionic liquids, deep eutectic solvents and liquid polymers as green solvents in carbon capture technologies: a review

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Abstract

Global warming is a critical issue resulting partly from increasing carbon dioxide emissions. Technologies have been developed to capture carbon dioxide followed by storage or utilization, yet techniques are limited by the use of toxic solvents and the generation of harmful by-products. Research in green chemistry has designed green solvents which are non-toxic, efficient and environmentally friendly. Here we review green solvents employed for carbon capture, with emphasis on ionic liquids, deep eutectic solvents and liquid polymers. Solvent performance depends on temperature, density and viscosity. Deep eutectic solvents appear as the most advanced solvents with capacities reaching up to 4.292 g CO2 per g of solvent. Ionic liquids have shown CO2 uptakes of 4.72 mol of CO2/mol of solvent, but are less efficient on average. Liquid polymers display capacities of up to 1.357 mol of CO2/mol of solvent.

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Abbreviations

TETAL:

Triethylenetetramine and lactic acid

UDIL:

Urea-derived ionic liquid

TSIL:

Task-specific ionic liquid

DFIL:

Dual-functional ionic liquid

PAPIL:

Pyridinium-containing amide-based ionic liquids

DBN:

1,5-Diazabicyclo[4.3.0]-non-5-ene

DBU:

1,8-Diazabicyclo[5.4.0]undec-7-ene

MTBD:

7-Methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene

DMLU:

Dimethylol urea

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Acknowledgements

The authors would like to place on record their heartfelt thanks to SSN College of Engineering, Chennai, for providing the opportunity to prepare this study.

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Correspondence to Kannappan Panchamoorthy Gopinath.

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The authors of this study would like to declare that there is no conflict of interest in the publishing of this paper.

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Krishnan, A., Gopinath, K.P., Vo, DV.N. et al. Ionic liquids, deep eutectic solvents and liquid polymers as green solvents in carbon capture technologies: a review. Environ Chem Lett 18, 2031–2054 (2020). https://doi.org/10.1007/s10311-020-01057-y

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  • DOI: https://doi.org/10.1007/s10311-020-01057-y

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