Multiobjective Optimization Based on “Distance-to-Target” Approach of Membrane Units for Separation of CO2/CH4

The effective separation of CO2 and CH4 mixtures is essential for many applications, such as biogas upgrading, natural gas sweetening or enhanced oil recovery. Membrane separations can contribute greatly in these tasks, and innovative membrane materials...

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Autores principales:	Ricardo Abejón, Clara Casado-Coterillo, Aurora Garea
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	gas separation membranes CO<sub>2</sub> CH<sub>4</sub> hollow fibers “distance to target” multiobjective optimization Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/a23322b303d64a3eab89d5e69d1d4459
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spelling	oai:doaj.org-article:a23322b303d64a3eab89d5e69d1d44592021-11-25T18:49:57ZMultiobjective Optimization Based on “Distance-to-Target” Approach of Membrane Units for Separation of CO<sub>2</sub>/CH<sub>4</sub>10.3390/pr91118712227-9717https://doaj.org/article/a23322b303d64a3eab89d5e69d1d44592021-10-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/1871https://doaj.org/toc/2227-9717The effective separation of CO<sub>2</sub> and CH<sub>4</sub> mixtures is essential for many applications, such as biogas upgrading, natural gas sweetening or enhanced oil recovery. Membrane separations can contribute greatly in these tasks, and innovative membrane materials are being developed for this gas separation. The aim of this work is the evaluation of the potential of two types of highly CO<sub>2</sub>-permeable membranes (modified commercial polydimethylsiloxane and non-commercial ionic liquid–chitosan composite membranes) whose selective layers possess different hydrophobic and hydrophilic characteristics for the separation of CO<sub>2</sub>/CH<sub>4</sub> mixtures. The study of the technical performance of the selected membranes can provide a better understanding of their potentiality. The optimization of the performance of hollow fiber modules for both types of membranes was carried out by a “distance-to-target” approach that considered multiple objectives related to the purities and recovery of both gases. The results demonstrated that the ionic liquid–chitosan composite membranes improved the performance of other innovative membranes, with purity and recovery percentage values of 86 and 95%, respectively, for CO<sub>2</sub> in the permeate stream, and 97 and 92% for CH<sub>4</sub> in the retentate stream. The developed multiobjective optimization allowed for the determination of the optimal process design and performance parameters, such as the membrane area, pressure ratio and stage cut required to achieve maximum values for component separation in terms of purity and recovery. Since the purities and recoveries obtained were not enough to fulfill the requirements imposed on CO<sub>2</sub> and CH<sub>4</sub> streams to be directly valorized, the design of more complex multi-stage separation systems was also proposed by the application of this optimization methodology, which is considered as a useful tool to advance the implementation of the membrane separation processes.Ricardo AbejónClara Casado-CoterilloAurora GareaMDPI AGarticlegas separationmembranesCO<sub>2</sub>CH<sub>4</sub>hollow fibers“distance to target” multiobjective optimizationChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 1871, p 1871 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	gas separation membranes CO<sub>2</sub> CH<sub>4</sub> hollow fibers “distance to target” multiobjective optimization Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	gas separation membranes CO<sub>2</sub> CH<sub>4</sub> hollow fibers “distance to target” multiobjective optimization Chemical technology TP1-1185 Chemistry QD1-999 Ricardo Abejón Clara Casado-Coterillo Aurora Garea Multiobjective Optimization Based on “Distance-to-Target” Approach of Membrane Units for Separation of CO<sub>2</sub>/CH<sub>4</sub>
description	The effective separation of CO<sub>2</sub> and CH<sub>4</sub> mixtures is essential for many applications, such as biogas upgrading, natural gas sweetening or enhanced oil recovery. Membrane separations can contribute greatly in these tasks, and innovative membrane materials are being developed for this gas separation. The aim of this work is the evaluation of the potential of two types of highly CO<sub>2</sub>-permeable membranes (modified commercial polydimethylsiloxane and non-commercial ionic liquid–chitosan composite membranes) whose selective layers possess different hydrophobic and hydrophilic characteristics for the separation of CO<sub>2</sub>/CH<sub>4</sub> mixtures. The study of the technical performance of the selected membranes can provide a better understanding of their potentiality. The optimization of the performance of hollow fiber modules for both types of membranes was carried out by a “distance-to-target” approach that considered multiple objectives related to the purities and recovery of both gases. The results demonstrated that the ionic liquid–chitosan composite membranes improved the performance of other innovative membranes, with purity and recovery percentage values of 86 and 95%, respectively, for CO<sub>2</sub> in the permeate stream, and 97 and 92% for CH<sub>4</sub> in the retentate stream. The developed multiobjective optimization allowed for the determination of the optimal process design and performance parameters, such as the membrane area, pressure ratio and stage cut required to achieve maximum values for component separation in terms of purity and recovery. Since the purities and recoveries obtained were not enough to fulfill the requirements imposed on CO<sub>2</sub> and CH<sub>4</sub> streams to be directly valorized, the design of more complex multi-stage separation systems was also proposed by the application of this optimization methodology, which is considered as a useful tool to advance the implementation of the membrane separation processes.
format	article
author	Ricardo Abejón Clara Casado-Coterillo Aurora Garea
author_facet	Ricardo Abejón Clara Casado-Coterillo Aurora Garea
author_sort	Ricardo Abejón
title	Multiobjective Optimization Based on “Distance-to-Target” Approach of Membrane Units for Separation of CO<sub>2</sub>/CH<sub>4</sub>
title_short	Multiobjective Optimization Based on “Distance-to-Target” Approach of Membrane Units for Separation of CO<sub>2</sub>/CH<sub>4</sub>
title_full	Multiobjective Optimization Based on “Distance-to-Target” Approach of Membrane Units for Separation of CO<sub>2</sub>/CH<sub>4</sub>
title_fullStr	Multiobjective Optimization Based on “Distance-to-Target” Approach of Membrane Units for Separation of CO<sub>2</sub>/CH<sub>4</sub>
title_full_unstemmed	Multiobjective Optimization Based on “Distance-to-Target” Approach of Membrane Units for Separation of CO<sub>2</sub>/CH<sub>4</sub>
title_sort	multiobjective optimization based on “distance-to-target” approach of membrane units for separation of co<sub>2</sub>/ch<sub>4</sub>
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/a23322b303d64a3eab89d5e69d1d4459
work_keys_str_mv	AT ricardoabejon multiobjectiveoptimizationbasedondistancetotargetapproachofmembraneunitsforseparationofcosub2subchsub4sub AT claracasadocoterillo multiobjectiveoptimizationbasedondistancetotargetapproachofmembraneunitsforseparationofcosub2subchsub4sub AT auroragarea multiobjectiveoptimizationbasedondistancetotargetapproachofmembraneunitsforseparationofcosub2subchsub4sub
_version_	1718410665036611584

Multiobjective Optimization Based on “Distance-to-Target” Approach of Membrane Units for Separation of CO<sub>2</sub>/CH<sub>4</sub>

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