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Vapor Pressure of Water in Mixtures with Hydrophilic Ionic Liquids : A Contribution to the Design of Processes for Drying of Gases by Absorption in Ionic Liquids

Title data

Heym, Florian ; Haber, J. ; Korth, Wolfgang ; Etzold, Bastian ; Jess, Andreas:
Vapor Pressure of Water in Mixtures with Hydrophilic Ionic Liquids : A Contribution to the Design of Processes for Drying of Gases by Absorption in Ionic Liquids.
In: Chemical Engineering & Technology. Vol. 33 (2010) Issue 10 . - pp. 1625-1634.
ISSN 1521-4125
DOI: https://doi.org/10.1002/ceat.201000146

Official URL: Volltext

Abstract in another language

The low water vapor pressures of mixtures of water with the ionic liquids (ILs), [EMIM][EtSO4] and [BEIM][EtSO4], indicate that a process of gas dehydration by absorption in ILs might be an alternative to the classical absorption process with triethylene glycol (TEG). The activity coefficient for an infinite dilution of water in the IL (xIL → 1), which should be low for efficient dehydration, is only about 0.2 for [EMIM][EtSO4] compared to 0.6 for triethylene glycol. In contrast to TEG, losses by evaporation are excluded with ILs as solvents, because they have a negligible vapor pressure. The number of separation stages needed for the absorption in the IL and for the subsequent regeneration of the water-loaded IL is small, about six and eight, respectively. IL regeneration can be achieved by distillation of water out of the IL (e.g., at 120 °C) and stripping with ambient air, which is not possible in the case of TEG (chemical attack by O2).

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Absorption; Activity coefficient; Gas dehydration; Ionic liquid; Stripping
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Chemical Engineering
Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess
Faculties
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 02 Feb 2015 09:38
Last Modified: 03 Feb 2015 11:00
URI: https://eref.uni-bayreuth.de/id/eprint/6136