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Ionic liquids in pressure-swing chemical absorption of CO2

Stegmaier, Tobias ORCID iD icon; Schäffer, Johannes; Ortloff, Felix; Iliev, Boran; Schubert, Thomas; 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 (ILs) 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 ILs, 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. We will present details of the mini-plant design and results of its operation under quasi-isothermal conditions. ... mehr

Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Publikationstyp Vortrag
Publikationsdatum 10.09.2019
Sprache Englisch
Identifikator KITopen-ID: 1000117658
Veranstaltung 4th International Conference on Ionic Liquids in Separation and Purification Technology (ILSEPT 2019), Sitges, Spanien, 08.09.2019 – 11.09.2019
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