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Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process

The paper presents the screening of 20 deep eutectic solvents (DESs) composed of tetrapropylammonium bromide (TPABr) and glycols in various molar ratios, and 6 conventional solvents as absorbents for removal of siloxanes from model biogas stream. The screening was achieved using the conductor-like s...

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Autores principales: Słupek, Edyta, Makoś-Chełstowska, Patrycja, Gębicki, Jacek
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7825351/
https://www.ncbi.nlm.nih.gov/pubmed/33418968
http://dx.doi.org/10.3390/ma14020241
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author Słupek, Edyta
Makoś-Chełstowska, Patrycja
Gębicki, Jacek
author_facet Słupek, Edyta
Makoś-Chełstowska, Patrycja
Gębicki, Jacek
author_sort Słupek, Edyta
collection PubMed
description The paper presents the screening of 20 deep eutectic solvents (DESs) composed of tetrapropylammonium bromide (TPABr) and glycols in various molar ratios, and 6 conventional solvents as absorbents for removal of siloxanes from model biogas stream. The screening was achieved using the conductor-like screening model for real solvents (COSMO-RS) based on the comparison of siloxane solubility in DESs. For the DES which was characterized by the highest solubility of siloxanes, studies of physicochemical properties, i.e., viscosity, density, and melting point, were performed. DES composed of tetrapropylammonium bromide (TPABr) and tetraethylene glycol (TEG) in a 1:3 molar ratio was used as an absorbent in experimental studies in which several parameters were optimized, i.e., the temperature, absorbent volume, and model biogas flow rate. The mechanism of siloxanes removal was evaluated by means of an experimental FT-IR analysis as well as by theoretical studies based on σ-profile and σ-potential. On the basis of the obtained results, it can be concluded that TPABr:TEG (1:3) is a very effective absorption solvent for the removal of siloxanes from model biogas, and the main driving force of the absorption process is the formation of the hydrogen bonds between DES and siloxanes.
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spelling pubmed-78253512021-01-24 Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process Słupek, Edyta Makoś-Chełstowska, Patrycja Gębicki, Jacek Materials (Basel) Article The paper presents the screening of 20 deep eutectic solvents (DESs) composed of tetrapropylammonium bromide (TPABr) and glycols in various molar ratios, and 6 conventional solvents as absorbents for removal of siloxanes from model biogas stream. The screening was achieved using the conductor-like screening model for real solvents (COSMO-RS) based on the comparison of siloxane solubility in DESs. For the DES which was characterized by the highest solubility of siloxanes, studies of physicochemical properties, i.e., viscosity, density, and melting point, were performed. DES composed of tetrapropylammonium bromide (TPABr) and tetraethylene glycol (TEG) in a 1:3 molar ratio was used as an absorbent in experimental studies in which several parameters were optimized, i.e., the temperature, absorbent volume, and model biogas flow rate. The mechanism of siloxanes removal was evaluated by means of an experimental FT-IR analysis as well as by theoretical studies based on σ-profile and σ-potential. On the basis of the obtained results, it can be concluded that TPABr:TEG (1:3) is a very effective absorption solvent for the removal of siloxanes from model biogas, and the main driving force of the absorption process is the formation of the hydrogen bonds between DES and siloxanes. MDPI 2021-01-06 /pmc/articles/PMC7825351/ /pubmed/33418968 http://dx.doi.org/10.3390/ma14020241 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Słupek, Edyta
Makoś-Chełstowska, Patrycja
Gębicki, Jacek
Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process
title Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process
title_full Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process
title_fullStr Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process
title_full_unstemmed Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process
title_short Removal of Siloxanes from Model Biogas by Means of Deep Eutectic Solvents in Absorption Process
title_sort removal of siloxanes from model biogas by means of deep eutectic solvents in absorption process
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7825351/
https://www.ncbi.nlm.nih.gov/pubmed/33418968
http://dx.doi.org/10.3390/ma14020241
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