Feed Flexibility of CH4 Combined Reforming for Methanol Production

Autores
Cañete, Benjamin; Brignole, Nélida Beatriz; Gigola, Carlos Eugenio
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Natural gas with high CO2 content is a readily available resource, whose application for synthesis gas (syngas) production through dry reforming is strictly limited to processes that require low H2/CO ratios. In a recent work we have demonstrated that methanol production through a process scheme based on combined reforming of methane (with CO2+H2O) becomes a viable alternative from both technical and economic viewpoints. The use of an H2 separation membrane, as well as a partial H2 reinjection into the loop reactor, has been considered for the syngas composition adjustment to stoichiometric conditions (M ≅ 2). The reformer and the methanol synthesis reactor were assumed at thermodynamic equilibrium conditions, i.e. at 950°C and 20 bar for the former, and at 250°C and 71 bar for the latter. By using a natural gas feed containing 30% CO2 and H2O/CH4 = 2, it is feasible to operate the synthesis reactor with a lower recycle ratio, as well as a CO2 concentration close to the one employed in industrial practice. Under the operating conditions mentioned above, the use of combined reforming for methanol synthesis turns out to be economically advantageous over the classical steam reforming process. In this work a study of the feed flexibility for combined reforming is carried out taking into account the existence of gas fields with CO2 contents higher than 30%. Feed mixtures containing 35% and 40% CO2 were analyzed, while maintaining the operating conditions for the reformer (P, T, H2O/CH4) and the synthesis reactor (P, T, M). For comparative purposes, a methanol plant producing 400,000 mtpy was considered. A higher CO2 content in the feed does not significantly alter the CH4 conversion, but increases the CO2 conversion and lowers the H2/CO ratio. Consequently, it is necessary to increase the separation and reinjection of H2 to keep stoichiometric conditions in the synthesis reactor. However, a moderate increase in CO2 concentration in the synthesis reactor cannot be avoided. It is also shown that the recycle ratio should be markedly reduced in order to achieve stable operation. This situation reduces the operating cost of the recycle compressor. On the other hand, the flow of CH4 + CO2 to the reformer should be increased for a constant methanol production, which in turn affects the reformer’s energy balance. The main operating costs of the methanol plant, with respect to the reference case (CO2/CH4 = 0.43), grow for CO2/CH4 = 0.55 and CO2/CH4 = 0.67 by 9.5% and 25%, respectively. This preliminary technical and economic analysis shows that combined reforming of natural gas with CO2 content up to 40% is a feasible process to produce methanol without CO2 removal.
Fil: Cañete, Benjamin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Brignole, Nélida Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Gigola, Carlos Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Materia
Combined Reforming
Methanol Production
Carbon Dioxide
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/25458

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spelling Feed Flexibility of CH4 Combined Reforming for Methanol ProductionCañete, BenjaminBrignole, Nélida BeatrizGigola, Carlos EugenioCombined ReformingMethanol ProductionCarbon Dioxidehttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2Natural gas with high CO2 content is a readily available resource, whose application for synthesis gas (syngas) production through dry reforming is strictly limited to processes that require low H2/CO ratios. In a recent work we have demonstrated that methanol production through a process scheme based on combined reforming of methane (with CO2+H2O) becomes a viable alternative from both technical and economic viewpoints. The use of an H2 separation membrane, as well as a partial H2 reinjection into the loop reactor, has been considered for the syngas composition adjustment to stoichiometric conditions (M ≅ 2). The reformer and the methanol synthesis reactor were assumed at thermodynamic equilibrium conditions, i.e. at 950°C and 20 bar for the former, and at 250°C and 71 bar for the latter. By using a natural gas feed containing 30% CO2 and H2O/CH4 = 2, it is feasible to operate the synthesis reactor with a lower recycle ratio, as well as a CO2 concentration close to the one employed in industrial practice. Under the operating conditions mentioned above, the use of combined reforming for methanol synthesis turns out to be economically advantageous over the classical steam reforming process. In this work a study of the feed flexibility for combined reforming is carried out taking into account the existence of gas fields with CO2 contents higher than 30%. Feed mixtures containing 35% and 40% CO2 were analyzed, while maintaining the operating conditions for the reformer (P, T, H2O/CH4) and the synthesis reactor (P, T, M). For comparative purposes, a methanol plant producing 400,000 mtpy was considered. A higher CO2 content in the feed does not significantly alter the CH4 conversion, but increases the CO2 conversion and lowers the H2/CO ratio. Consequently, it is necessary to increase the separation and reinjection of H2 to keep stoichiometric conditions in the synthesis reactor. However, a moderate increase in CO2 concentration in the synthesis reactor cannot be avoided. It is also shown that the recycle ratio should be markedly reduced in order to achieve stable operation. This situation reduces the operating cost of the recycle compressor. On the other hand, the flow of CH4 + CO2 to the reformer should be increased for a constant methanol production, which in turn affects the reformer’s energy balance. The main operating costs of the methanol plant, with respect to the reference case (CO2/CH4 = 0.43), grow for CO2/CH4 = 0.55 and CO2/CH4 = 0.67 by 9.5% and 25%, respectively. This preliminary technical and economic analysis shows that combined reforming of natural gas with CO2 content up to 40% is a feasible process to produce methanol without CO2 removal.Fil: Cañete, Benjamin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Brignole, Nélida Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Gigola, Carlos Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaElsevier2015-06-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/25458Cañete, Benjamin; Brignole, Nélida Beatriz; Gigola, Carlos Eugenio; Feed Flexibility of CH4 Combined Reforming for Methanol Production; Elsevier; Computer-Aided Chemical Engineering; 37; 10-6-2015; 1343-13481570-7946CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/B978-0-444-63577-8.50069-3info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/B9780444635778500693info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:28:39Zoai:ri.conicet.gov.ar:11336/25458instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:28:39.766CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Feed Flexibility of CH4 Combined Reforming for Methanol Production
title Feed Flexibility of CH4 Combined Reforming for Methanol Production
spellingShingle Feed Flexibility of CH4 Combined Reforming for Methanol Production
Cañete, Benjamin
Combined Reforming
Methanol Production
Carbon Dioxide
title_short Feed Flexibility of CH4 Combined Reforming for Methanol Production
title_full Feed Flexibility of CH4 Combined Reforming for Methanol Production
title_fullStr Feed Flexibility of CH4 Combined Reforming for Methanol Production
title_full_unstemmed Feed Flexibility of CH4 Combined Reforming for Methanol Production
title_sort Feed Flexibility of CH4 Combined Reforming for Methanol Production
dc.creator.none.fl_str_mv Cañete, Benjamin
Brignole, Nélida Beatriz
Gigola, Carlos Eugenio
author Cañete, Benjamin
author_facet Cañete, Benjamin
Brignole, Nélida Beatriz
Gigola, Carlos Eugenio
author_role author
author2 Brignole, Nélida Beatriz
Gigola, Carlos Eugenio
author2_role author
author
dc.subject.none.fl_str_mv Combined Reforming
Methanol Production
Carbon Dioxide
topic Combined Reforming
Methanol Production
Carbon Dioxide
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv Natural gas with high CO2 content is a readily available resource, whose application for synthesis gas (syngas) production through dry reforming is strictly limited to processes that require low H2/CO ratios. In a recent work we have demonstrated that methanol production through a process scheme based on combined reforming of methane (with CO2+H2O) becomes a viable alternative from both technical and economic viewpoints. The use of an H2 separation membrane, as well as a partial H2 reinjection into the loop reactor, has been considered for the syngas composition adjustment to stoichiometric conditions (M ≅ 2). The reformer and the methanol synthesis reactor were assumed at thermodynamic equilibrium conditions, i.e. at 950°C and 20 bar for the former, and at 250°C and 71 bar for the latter. By using a natural gas feed containing 30% CO2 and H2O/CH4 = 2, it is feasible to operate the synthesis reactor with a lower recycle ratio, as well as a CO2 concentration close to the one employed in industrial practice. Under the operating conditions mentioned above, the use of combined reforming for methanol synthesis turns out to be economically advantageous over the classical steam reforming process. In this work a study of the feed flexibility for combined reforming is carried out taking into account the existence of gas fields with CO2 contents higher than 30%. Feed mixtures containing 35% and 40% CO2 were analyzed, while maintaining the operating conditions for the reformer (P, T, H2O/CH4) and the synthesis reactor (P, T, M). For comparative purposes, a methanol plant producing 400,000 mtpy was considered. A higher CO2 content in the feed does not significantly alter the CH4 conversion, but increases the CO2 conversion and lowers the H2/CO ratio. Consequently, it is necessary to increase the separation and reinjection of H2 to keep stoichiometric conditions in the synthesis reactor. However, a moderate increase in CO2 concentration in the synthesis reactor cannot be avoided. It is also shown that the recycle ratio should be markedly reduced in order to achieve stable operation. This situation reduces the operating cost of the recycle compressor. On the other hand, the flow of CH4 + CO2 to the reformer should be increased for a constant methanol production, which in turn affects the reformer’s energy balance. The main operating costs of the methanol plant, with respect to the reference case (CO2/CH4 = 0.43), grow for CO2/CH4 = 0.55 and CO2/CH4 = 0.67 by 9.5% and 25%, respectively. This preliminary technical and economic analysis shows that combined reforming of natural gas with CO2 content up to 40% is a feasible process to produce methanol without CO2 removal.
Fil: Cañete, Benjamin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Brignole, Nélida Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
Fil: Gigola, Carlos Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentina
description Natural gas with high CO2 content is a readily available resource, whose application for synthesis gas (syngas) production through dry reforming is strictly limited to processes that require low H2/CO ratios. In a recent work we have demonstrated that methanol production through a process scheme based on combined reforming of methane (with CO2+H2O) becomes a viable alternative from both technical and economic viewpoints. The use of an H2 separation membrane, as well as a partial H2 reinjection into the loop reactor, has been considered for the syngas composition adjustment to stoichiometric conditions (M ≅ 2). The reformer and the methanol synthesis reactor were assumed at thermodynamic equilibrium conditions, i.e. at 950°C and 20 bar for the former, and at 250°C and 71 bar for the latter. By using a natural gas feed containing 30% CO2 and H2O/CH4 = 2, it is feasible to operate the synthesis reactor with a lower recycle ratio, as well as a CO2 concentration close to the one employed in industrial practice. Under the operating conditions mentioned above, the use of combined reforming for methanol synthesis turns out to be economically advantageous over the classical steam reforming process. In this work a study of the feed flexibility for combined reforming is carried out taking into account the existence of gas fields with CO2 contents higher than 30%. Feed mixtures containing 35% and 40% CO2 were analyzed, while maintaining the operating conditions for the reformer (P, T, H2O/CH4) and the synthesis reactor (P, T, M). For comparative purposes, a methanol plant producing 400,000 mtpy was considered. A higher CO2 content in the feed does not significantly alter the CH4 conversion, but increases the CO2 conversion and lowers the H2/CO ratio. Consequently, it is necessary to increase the separation and reinjection of H2 to keep stoichiometric conditions in the synthesis reactor. However, a moderate increase in CO2 concentration in the synthesis reactor cannot be avoided. It is also shown that the recycle ratio should be markedly reduced in order to achieve stable operation. This situation reduces the operating cost of the recycle compressor. On the other hand, the flow of CH4 + CO2 to the reformer should be increased for a constant methanol production, which in turn affects the reformer’s energy balance. The main operating costs of the methanol plant, with respect to the reference case (CO2/CH4 = 0.43), grow for CO2/CH4 = 0.55 and CO2/CH4 = 0.67 by 9.5% and 25%, respectively. This preliminary technical and economic analysis shows that combined reforming of natural gas with CO2 content up to 40% is a feasible process to produce methanol without CO2 removal.
publishDate 2015
dc.date.none.fl_str_mv 2015-06-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/25458
Cañete, Benjamin; Brignole, Nélida Beatriz; Gigola, Carlos Eugenio; Feed Flexibility of CH4 Combined Reforming for Methanol Production; Elsevier; Computer-Aided Chemical Engineering; 37; 10-6-2015; 1343-1348
1570-7946
CONICET Digital
CONICET
url http://hdl.handle.net/11336/25458
identifier_str_mv Cañete, Benjamin; Brignole, Nélida Beatriz; Gigola, Carlos Eugenio; Feed Flexibility of CH4 Combined Reforming for Methanol Production; Elsevier; Computer-Aided Chemical Engineering; 37; 10-6-2015; 1343-1348
1570-7946
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/B978-0-444-63577-8.50069-3
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/B9780444635778500693
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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eu_rights_str_mv openAccess
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dc.format.none.fl_str_mv application/pdf
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
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reponame_str CONICET Digital (CONICET)
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repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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