Estudo de adsorção de ácidos naftênicos a partir de correntes de hidrocarbonetos

• Autor(a) principal: Silva, Juliana Pereira
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/11950
• topic: adsorption; naphthenic acids; clay; active alumina; corrosion; adsorção; ácidos naftênicos; argila; alumina ativada; corrosão; CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA

Naphthenic acids comprise a complex mixture of carboxylic acids that are present in petroleum. They are directly responsible for the oil acidity and its corrosiveness in liquid phase during the refining process. Such compounds are also presents in the derivatives, causing several problems to product quality. A possible way of removing these acids from those oil fractions is using the adsorption process in porous solids. Nevertheless, results presented so far show that ion exchange resins would be the best adsorbent for these acids, which could make this process very expensive. In this work, two commercial adsorbents (clay and activated alumina) were characterized by several physical-chemistry techniques and evaluated concerning their capacity of removing naphthenic acids from average and heavy fractions of crude oil. For comparison the behavior of commercial naphthenic acids in synthetic commercial samples prepared with mineral oil was also evaluated. In addition, the carbon steel corrosiveness in the studied systems was verified. Clay adsorbent presented better affinity with the acids, showing a greater capacity and a faster kinetics than alumina for synthetic oils. However, because of the higher competition with the other components present in real oils for the adsorption sites, a loss of efficiency for these samples was observed. In that case, alumina showed better results. Although both adsorbents have showed good capacity of removal of acids, the ion exchange resin still presented the best results for real samples. At the conditions of this study, the steel corrosiveness in the synthetic oils, as well as the data obtained for two of the real ones, was not significant, and only one of the real samples (Oil 1) corroded the carbon steel coupon. However, the naphthenic acid removal was able to reduce the corrosiveness in this medium up to 99%