Ionic liquid-amine blends and CO2BOLs: Prospective solvents for natural gas sweetening and CO2 capture technology—A review

International Journal of Greenhouse Gas Control, Volume 20, January 2014, Pages 87–116
Ionic liquid-amine blends and CO2BOLs: Prospective solvents for natural gas sweetening and CO2 capture technology—A review
Satish Kumar, Jae Hyun Cho, Il Moon
Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea
Abstract
Conventional natural gas sweetening and post combustion CO2 capture technologies are amine-based. Unfortunately, amine based technologies have a couple of disadvantages. They are: solvent loss, and the corrosive nature and high heat of solution. Ionic liquids (ILs) based separations are less energy intensive, and have increased in popularity over amines as CO2 scrubbing agents, thanks to their exceptional physicochemical properties.
ILs also have a few disadvantages, however. They include hygroscopic nature, high viscosity and high cost. Accordingly, coupling of the advantages of both ILs and amines may provide a better route for effective capture of CO2. The main task of the coupling is to take advantage of good aspects of parent solvents. Recently, a new class of solvents called binding organic liquids (BOLs) or switchable solvents has also been discovered. BOLs have tunable physicochemical properties like ILs.
Authors review recent state-of-the-art of comprehensive applications of aqueous amines, ILs, IL-amine blends and BOLs for natural gas sweetening and health/environmental impacts of amine.
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