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Previous issue date: 2014-03-11 / The carbon capture and storage technologies are listed among the important strategies for reducing the CO2 emissions and mitigate climate change in a fossil fuel dependant world. Among CO2 capture techniques, chemical absorption process which uses aqueous amines solutions has been extensively studied and used in the industry for decades. However, this process has a number of drawbacks. In order to deal with the great number of drawbacks caused by amines, recently, mixtures of aqueous amine solutions and ILs (Ionic Liquids) have been appointed as potencial solvents for CO2 capture, because allow to combine the properties and benefits of ILs with gas absorption capacity of aqueous amine solutions. In this work, carbon steel corrosion behavior in mixtures of aqueous amines solutions (MEA or MDEA) and 1-Butyl-3-methylimidazolium tetrafluoroborate [bmim] [BF4] in typical conditions of temperature and pressure of CO2 capture process (45 ?C and 27 bar) was investigated. The corrosion rate was determined by weight loss measurements. The chemical composition, morphology and characteristics of the corrosion product scales formed on the surface of steel were analyzed by using surface techniques (SEM and EDS). The properties of the corrosion product scales were also evaluated by potentiodynamic polarization technique. The CO2 absorption was measured at 45 ?C and pressures from 1 to 27 bar using a Magnetic Suspension Balance (MSB). The results showed that the addition of 10 % of [bmim] [BF4] in weight at the aqueous amine solutions can provide a feasible and efficiently opportunity for CO2 capture, because in MEA (M0), a considerably decrease of 72% on the corrosion rate was observed and the CO2 absorption values were close to the ones obtained for MDEA (MD0), whereas for MDEA (MD0), the addition of 10 % of [bmim] [BF4] did not change considerably the CO2 absorption and also the corrosion rate decreased (26%). / Tecnologias de captura e armazenamento de carbono s?o apontadas como uma das principais tecnologias para reduzir as emiss?es de CO2 e mitigar o efeito das mudan?as clim?ticas. Entre as t?cnicas de captura de CO2, o processo de absor??o qu?mica que utilizam as solu??es aquosas de aminas tem sido extensivamente estudado e utilizado por d?cadas. No entanto, estes processos apresentam uma s?rie de inconvenientes. A fim de lidar com estes inconvenientes, recentemente, misturas de solu??es de amina aquosas e LIs (L?quidos I?nicos) tem sido apontado como solventes potenciais para captura, pois permitem combinar as propriedades e os benef?cios de LIs com capacidade de absor??o de g?s das solu??es aquosas de amina. Neste trabalho foi investigado o comportamento de corros?o do a?o carbono em misturas de solu??es aquosas de aminas (MEA ou MDEA) e [bmim] [BF4] em condi??es t?picas de press?o e temperatura (45 ?C e 27 bar) empregadas em plantas de captura de CO2, bem como o efeito da adi??o de LIs em solu??es aquosas de aminas sobre a capacidade de absor??o do CO2. A taxa de corros?o foi determinada por medidas de perda de massa. A composi??o qu?mica, a morfologia e as caracter?sticas dos filmes de produtos de corros?o formados foram analisados usando t?cnicas de superf?cie (MEV e EDS). As propriedades dos filmes de produtos de corros?o tamb?m foram avaliadas pela t?cnica de polariza??o potenciodin?mica. A absor??o de CO2 foi medida a 45 ? C e press?es de 1-27 bar, usando uma balan?a de suspens?o magn?tica (MSB). Os resultados mostraram que a adi??o de 10% de [bmim] [BF4] em massa nas solu??es aquosas de aminas pode proporcionar um solvente vi?vel e eficiente para a captura, pois na MEA (M0) foi observado uma redu??o consider?vel na taxa de corros?o (72%) e os valores de absor??o de CO2 ficaram pr?ximos aos obtido para MDEA (MD0), enquanto que para MDEA (MD0), a adi??o de 10 % de [bmim] [BF4] n?o alterou consideravelmente a absor??o de CO2 e tamb?m proporcionou a redu??o de 26% na taxas de corros?o.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/3251 |
| Date | 11 March 2014 |
| Creators | Bernard, Franciele Longaray |
| Contributors | Einloft, Sandra Mara Oliveira |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Engenharia e Tecnologia de Materiais, PUCRS, BR, Faculdade de Engenharia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 7432719344215120122, 500, 600, 655770572761439785 |
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