Siloxanes capture by ionic liquids: Solvent selection and process evaluation

Santiago, Rubén, Moya, Cristian y Palomar, José . (2020) Siloxanes capture by ionic liquids: Solvent selection and process evaluation. Chemical Engineering Journal, 401, 1 December 2020, 126078

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Título Siloxanes capture by ionic liquids: Solvent selection and process evaluation
Autor(es) Santiago, Rubén
Moya, Cristian
Palomar, José
Materia(s) Ingeniería Industrial
Abstract Nowadays, new technologies are being developed to substitute conventional energy resources. Biogas has emerged to avoid the intensification of global warming and promote waste valorization. However, undesirable chemicals must be removed prior to its utilization. Siloxanes stand out as biogas contaminants since they can damage process equipment’s. Therefore, in this work, COSMO-based/Aspen Plus computational methodology was applied to evaluate, as first-time, ionic liquids (ILs) as siloxanes absorbents on biogas upgrading context. Thus, molecular simulation using COSMO-RS method was used to analyze the interactions between siloxanes/ILs based on excess properties. Moreover, it was used to select the most promising ILs among a wide sample (9 0 0) of solvents for latter process simulation stage based on thermodynamics (Henry’s law constants) and kinetics (low viscosity). The results revealed that ILs with fluorinated anions are the best for the task. Then, the performance of selected ILs on siloxane capture at industrial scale was evaluated by means of Aspen Plus process simulations. Thus, the absorption efficiency in a packed column was analyzed by comparing the silicon concentration in outlet gas stream for each IL, using a rigorous RADFRAC column in Rate-base mode. Operating pressure inside the column was also studied as key operating variable. Last, simulations of the complete siloxane capture processes were carried out to treat a realistic biogas stream, including the analysis of both absorption and regeneration columns. Process simulation results revealed that thermodynamics is the key property for the selection of ILs for siloxanes capture. Moreover, most of the selected ILs can satisfy silicon outlet concentration legislation (< 5 mgSi/Nm3 ) in almost all the studied operating conditions. Last, solvent regeneration using air stripping column demonstrated the reversibility of the process in mild conditions of temperature (100 °C) and vacuum pressure (0.1 bar). In sum, ILs are proposed as promising siloxanes absorbents of siloxanes-containing streams, mainly focused on biogas upgrading.
Palabras clave Siloxanes
Ionic liquids
Biogas
Absorption
Editor(es) Elsevier
Fecha 2020-12-01
Formato application/pdf
Identificador bibliuned:DptoIEEC-ETSI-Articulos-Rsantiago-0006
http://e-spacio.uned.es/fez/view/bibliuned:DptoIEEC-ETSI-Articulos-Rsantiago-0006
DOI - identifier 10.1016/j.cej.2020.126078
ISSN - identifier 1873-3212
Nombre de la revista Chemical Engineering Journal
Número de Volumen 401
Publicado en la Revista Chemical Engineering Journal, 401, 1 December 2020, 126078
Versión de la publicación acceptedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by-nc-nd/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales The registered version of this article, first published in Chemical Engineering Journal, is available online at the publisher's website: Elsevier, https://doi.org/10.1016/j.cej.2020.126078
Notas adicionales La versión registrada de este artículo, publicado por primera vez en Chemical Engineering Journal, está disponible en línea en el sitio web del editor: Elsevier, https://doi.org/10.1016/j.cej.2020.126078

 
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Creado: Tue, 16 Jan 2024, 01:55:30 CET