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Determination of water loading of supported ionic liquids by microwave analysis : A contribution for operando monitoring of gas drying by adsorption

Title data

Malashchuk, Vladimir ; Jess, Andreas ; Moos, Ralf:
Determination of water loading of supported ionic liquids by microwave analysis : A contribution for operando monitoring of gas drying by adsorption.
In: Sensors and Actuators B: Chemical. Vol. 335 (May 2021) . - No. 129646.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2021.129646

Official URL: Volltext

Abstract in another language

Ionic liquids (ILs) immobilized on solid porous supports are alternative materials for gas drying by fixed-bed adsorption: The IL 1-ethyl-3-methylimidazolium methanesulfonate has a high capacity for sorption of water vapor, and losses of the IL via evaporation are negligible because of the extremely low vapor pressure. Hence, ILs can be durably immobilized by coating of porous supports. Ionic liquids have a high electrical conductivity compared to supports such as silica. This can be utilized to monitor the water loading of supported IL by microwaves. A fixed-bed adsorber was placed in a cylindrical microwave resonator, and the water loading and the corresponding electrical signals were measured by a humidity sensor and a network analyzer, respectively. The partial pressure of steam (carrier gas N2) and the temperature were varied in a range relevant for gas drying (5–20 mbar; 40–90 °C). The results reveal that the microwave parameters, such as the resonance frequency shift, are suitable to determine accurately and operando the water loading of supported ionic liquids. Further analysis of the microwave parameters leads to the complex susceptibility, which in turn shows a linear dependence of the polarization effects on the electrical losses.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Microwave resonator; Supported ionic liquid phase; Electrical susceptibility
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 > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Research Institutions
Research Institutions > Research Units
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: 25 Jun 2021 08:55
Last Modified: 25 Jun 2021 08:55
URI: https://eref.uni-bayreuth.de/id/eprint/66177