Caracterização de asfaltenos e subfrações por espectrometria de massas de Ionização e dessorção à laser (LDI-MS)

• Ano de defesa: 2023
• Autor(a) principal: Fonseca, Victor da Rocha
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Química; Centro de Ciências Exatas; UFES; Programa de Pós-Graduação em Química
• Palavras-chave em Português: Espectrometria de massas; LDI MS; APPI MS; Asfaltenos; Caracterização; subject.br-rjbn; Química
• Link de acesso: http://repositorio.ufes.br/handle/10/16715

Currently, one of the major problems in the oil industry is the deposition of asphaltenes, which can occur throughout the production chain. This occurs due to their tendency to aggregate and precipitate when exposed to physical-chemical variations, thus causing major impacts and economic losses for the industries involved. In addition, the preparation of increasingly uniform samples, in terms of composition and physical-chemical properties, is carried out through the application of fractionation methods, enabling a more effective study of these complex compounds. The study and elucidation of the behaviors and chemical characteristics of asphaltenes are of utmost importance for the development of treatments capable of preventing or mitigating this deposition generated. The Laser Desorption Ionization (LDI) technique coupled with mass spectrometry (MS) emerges as a viable option for the characterization of asphaltenes. In view of this scenario, general concepts related to the characterization of asphaltenes and their subfractions, as well as the evolution of their structural models and the application of mass spectrometry with emphasis on the LDI-MS ionization technique will be addressed in this state of the art.