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Providing CO2 by pressure-swing chemical absorption: Ionic liquid-based CO2 separation technology

Stegmaier, Tobias ORCID iD icon; Schäffer, Johannes; Ortloff, Felix; Graf, Frank; Kolb, Thomas

Abstract (englisch):

CO2 separation from gases with the aim of further utilization (carbon dioxide capture and utilization, CCU) is a vivid field of research where also the use of ionic liquids (IL) as solvents has been discussed. State-of-the-art processes for chemical absorption of CO2 mainly use aqueous solutions of amines. However, these processes generally suffer from the high thermal energy demand for CO2 desorption at elevated temperature. Recently, we have presented a new absorption process based on IL, which allows for efficient separation of CO2 in biogas upgrading. Contrary to other approaches, key feature of this process is the regeneration of the solvent at reduced pressure. Owing to the negligible vapour pressure of IL, evaporative loss of solvent is avoided. The quasi-isothermal process design results in a distinctly reduced energy demand (ca. 50 %) compared to conventional chemical scrubbing systems.
In this contribution, we give an overview over physico-chemical characterization data of different ILs relevant for CO2 absorption. To test promising IL candidates under realistic, i. e. continuous conditions, a mini-plant was developed. ... mehr

Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Publikationstyp Vortrag
Publikationsdatum 24.06.2019
Sprache Englisch
Identifikator KITopen-ID: 1000097656
Veranstaltung 17th International Conference on Carbon Dioxide Utilization (ICCDU 2019), Aachen, Deutschland, 23.06.2019 – 27.06.2019
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