Cinética da reação de desidratação de etanol em alumina
Ano de defesa: | 2015 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
|
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Engenharia de Processos
|
Departamento: |
Engenharia de Processos
|
País: |
BR
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/7989 |
Resumo: | Ethene or ethylene is a hydrocarbon mainly used in plastic manufacture, through the polymerization. The production of ethene in large scale is performed through cracking process of oil light fractions. In the incessant search of clean and renewable sources to reduce the emission of greenhouse gases, it has been studied the ethylene production with alternative routes. Among the alternative ways of production, the dehydration reaction of ethanol with acid catalysts, like alumina, consists in a very interesting route, since ethanol is widely produced in Brazil, mainly by fermentation of sugarcane juice. However, with relation to the reaction mechanism of the catalytic conversion of the ethanol to ethene, there are some questions when aluminas are used. Therefore, the objective of this work is the study of two metastable forms of aluminas with different acid characteristics, γ- e η-alumina, in order to elucidate the mechanism of dehydration reaction of ethanol to ethene and compare the performance of these two aluminas. For that, two aluminum hydroxides, boehmite and bayerite, were treated in three different temperatures, leading to six catalysts with different acid properties. The catalysts were characterized and in situ reactions with DRIFTS were performed to understand the reaction mechanism. Also, it has studied the reaction kinetics with experiments in laboratory scale unit reaction. With literature information and DRIFTS analysis, some kinetic models were proposed in order to obtain a reaction rate model and to estimate the kinetics parameters. The models presented good adjusts to the experimental data and contributed to the comprehension of the reaction mechanism of ethanol catalytic dehydration. |
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2015-06-222015-06-222015-02-25OSMARI, Taynara Andrea. Kinetics of the dehydration reaction of ethanol on alumina. 2015. 118 f. Dissertação (Mestrado em Engenharia) - Universidade Federal de Santa Maria, Santa Maria, 2015.http://repositorio.ufsm.br/handle/1/7989Ethene or ethylene is a hydrocarbon mainly used in plastic manufacture, through the polymerization. The production of ethene in large scale is performed through cracking process of oil light fractions. In the incessant search of clean and renewable sources to reduce the emission of greenhouse gases, it has been studied the ethylene production with alternative routes. Among the alternative ways of production, the dehydration reaction of ethanol with acid catalysts, like alumina, consists in a very interesting route, since ethanol is widely produced in Brazil, mainly by fermentation of sugarcane juice. However, with relation to the reaction mechanism of the catalytic conversion of the ethanol to ethene, there are some questions when aluminas are used. Therefore, the objective of this work is the study of two metastable forms of aluminas with different acid characteristics, γ- e η-alumina, in order to elucidate the mechanism of dehydration reaction of ethanol to ethene and compare the performance of these two aluminas. For that, two aluminum hydroxides, boehmite and bayerite, were treated in three different temperatures, leading to six catalysts with different acid properties. The catalysts were characterized and in situ reactions with DRIFTS were performed to understand the reaction mechanism. Also, it has studied the reaction kinetics with experiments in laboratory scale unit reaction. With literature information and DRIFTS analysis, some kinetic models were proposed in order to obtain a reaction rate model and to estimate the kinetics parameters. The models presented good adjusts to the experimental data and contributed to the comprehension of the reaction mechanism of ethanol catalytic dehydration.O eteno ou etileno é um hidrocarboneto utilizado principalmente na fabricação de plásticos, através de sua polimerização. A produção de eteno em larga escala é realizada através do processo de craqueamento de frações leves do petróleo. Na incessante busca por fontes limpas e renováveis para reduzir a emissão de gases poluentes na atmosfera, tem-se o estudo da produção de eteno por rotas alternativas. Dentre os meios alternativos de produção, a reação de desidratação de etanol com catalisadores ácidos, como a alumina, consiste em uma rota muito interessante, já que o etanol é amplamente produzido no Brasil, principalmente através da fermentação do caldo de cana-de-açúcar. No entanto, com relação ao mecanismo reacional da conversão catalítica de etanol em eteno, ainda existem algumas questões quando aluminas são usadas. Portanto, o objetivo deste trabalho é o estudo de duas formas metaestáveis de aluminas com diferentes características ácidas, γ- e η-alumina, a fim de elucidar o mecanismo da reação de desidratação do etanol a eteno e comparar o desempenho das duas aluminas. Para isso, dois hidróxidos de alumínio, boemita e bayerita, foram tratados em três diferentes temperaturas, obtendo-se seis catalisadores com diferentes propriedades ácidas. Os catalisadores foram caracterizados e reações in situ por meio de DRIFTS foram realizadas para compreensão do mecanismo reacional. Ainda, estudou-se a cinética reacional por meio de experimentos em unidade de reações de escala de laboratório. Com informações da literatura e das análises de DRIFTS, alguns modelos cinéticos foram propostos com a finalidade de se obter um modelo de taxa de reação e estimar os parâmetros cinéticos. Os modelos apresentaram um bom ajuste aos dados experimentais e contribuíram na compreensão do mecanismo da reação de desidratação catalítica de etanol.Fundação de Amparo a Pesquisa no Estado do Rio Grande do Sulapplication/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em Engenharia de ProcessosUFSMBREngenharia de ProcessosAluminaEtenoDesidratação do etanolDRIFTSEstimação de parâmetrosAluminaEtheneEthanol dehydrationParameter estimationCNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAOCinética da reação de desidratação de etanol em aluminaKinetics of the dehydration reaction of ethanol on aluminainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisSchwaab, Marciohttp://lattes.cnpq.br/7572439258027513Castilhos, Fernanda dehttp://lattes.cnpq.br/4590978604104577Muniz, André Rodrigueshttp://lattes.cnpq.br/2593649837722014http://lattes.cnpq.br/8862923856608795Osmari, Taynara Andrea3008000000054003003003003006cf90fef-7b71-4f2c-afce-8ee5697dc4de0ceabbd6-19de-43a5-b043-6d9bb1e88e17d35d3245-47c9-4ccf-98e6-e9c80a1042b61f793b3d-841b-423b-801f-bf41b25934a0info:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALOSMARI, TAYNARA ANDREA.pdfapplication/pdf7636498http://repositorio.ufsm.br/bitstream/1/7989/1/OSMARI%2c%20TAYNARA%20ANDREA.pdf4a1cb8e6a5563db6a1394e4c7dc3d570MD51TEXTOSMARI, TAYNARA ANDREA.pdf.txtOSMARI, TAYNARA ANDREA.pdf.txtExtracted texttext/plain153474http://repositorio.ufsm.br/bitstream/1/7989/2/OSMARI%2c%20TAYNARA%20ANDREA.pdf.txt391837f22b0192fa80eeced77f4cd2f1MD52THUMBNAILOSMARI, TAYNARA ANDREA.pdf.jpgOSMARI, TAYNARA ANDREA.pdf.jpgIM Thumbnailimage/jpeg4553http://repositorio.ufsm.br/bitstream/1/7989/3/OSMARI%2c%20TAYNARA%20ANDREA.pdf.jpg72aa7bdf87ccb923eb507c625ff3706eMD531/79892022-03-16 15:37:16.318oai:repositorio.ufsm.br:1/7989Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-03-16T18:37:16Biblioteca Digital de Teses e Dissertações do UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Cinética da reação de desidratação de etanol em alumina |
dc.title.alternative.eng.fl_str_mv |
Kinetics of the dehydration reaction of ethanol on alumina |
title |
Cinética da reação de desidratação de etanol em alumina |
spellingShingle |
Cinética da reação de desidratação de etanol em alumina Osmari, Taynara Andrea Alumina Eteno Desidratação do etanol DRIFTS Estimação de parâmetros Alumina Ethene Ethanol dehydration Parameter estimation CNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAO |
title_short |
Cinética da reação de desidratação de etanol em alumina |
title_full |
Cinética da reação de desidratação de etanol em alumina |
title_fullStr |
Cinética da reação de desidratação de etanol em alumina |
title_full_unstemmed |
Cinética da reação de desidratação de etanol em alumina |
title_sort |
Cinética da reação de desidratação de etanol em alumina |
author |
Osmari, Taynara Andrea |
author_facet |
Osmari, Taynara Andrea |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Schwaab, Marcio |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/7572439258027513 |
dc.contributor.referee1.fl_str_mv |
Castilhos, Fernanda de |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/4590978604104577 |
dc.contributor.referee2.fl_str_mv |
Muniz, André Rodrigues |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/2593649837722014 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/8862923856608795 |
dc.contributor.author.fl_str_mv |
Osmari, Taynara Andrea |
contributor_str_mv |
Schwaab, Marcio Castilhos, Fernanda de Muniz, André Rodrigues |
dc.subject.por.fl_str_mv |
Alumina Eteno Desidratação do etanol DRIFTS Estimação de parâmetros |
topic |
Alumina Eteno Desidratação do etanol DRIFTS Estimação de parâmetros Alumina Ethene Ethanol dehydration Parameter estimation CNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAO |
dc.subject.eng.fl_str_mv |
Alumina Ethene Ethanol dehydration Parameter estimation |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAO |
description |
Ethene or ethylene is a hydrocarbon mainly used in plastic manufacture, through the polymerization. The production of ethene in large scale is performed through cracking process of oil light fractions. In the incessant search of clean and renewable sources to reduce the emission of greenhouse gases, it has been studied the ethylene production with alternative routes. Among the alternative ways of production, the dehydration reaction of ethanol with acid catalysts, like alumina, consists in a very interesting route, since ethanol is widely produced in Brazil, mainly by fermentation of sugarcane juice. However, with relation to the reaction mechanism of the catalytic conversion of the ethanol to ethene, there are some questions when aluminas are used. Therefore, the objective of this work is the study of two metastable forms of aluminas with different acid characteristics, γ- e η-alumina, in order to elucidate the mechanism of dehydration reaction of ethanol to ethene and compare the performance of these two aluminas. For that, two aluminum hydroxides, boehmite and bayerite, were treated in three different temperatures, leading to six catalysts with different acid properties. The catalysts were characterized and in situ reactions with DRIFTS were performed to understand the reaction mechanism. Also, it has studied the reaction kinetics with experiments in laboratory scale unit reaction. With literature information and DRIFTS analysis, some kinetic models were proposed in order to obtain a reaction rate model and to estimate the kinetics parameters. The models presented good adjusts to the experimental data and contributed to the comprehension of the reaction mechanism of ethanol catalytic dehydration. |
publishDate |
2015 |
dc.date.accessioned.fl_str_mv |
2015-06-22 |
dc.date.available.fl_str_mv |
2015-06-22 |
dc.date.issued.fl_str_mv |
2015-02-25 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
OSMARI, Taynara Andrea. Kinetics of the dehydration reaction of ethanol on alumina. 2015. 118 f. Dissertação (Mestrado em Engenharia) - Universidade Federal de Santa Maria, Santa Maria, 2015. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/7989 |
identifier_str_mv |
OSMARI, Taynara Andrea. Kinetics of the dehydration reaction of ethanol on alumina. 2015. 118 f. Dissertação (Mestrado em Engenharia) - Universidade Federal de Santa Maria, Santa Maria, 2015. |
url |
http://repositorio.ufsm.br/handle/1/7989 |
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Universidade Federal de Santa Maria |
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Engenharia de Processos |
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Universidade Federal de Santa Maria |
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