Compostos de enxofre em misturas de diesel e biodiesel

• Autor(a) principal: Vasconcelos, Adriana Palmeiro de
• Data de Publicação: 2008
• 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/1/15776
• topic: Sulfur; diesel; biodiesel; Enxofre; diesel; biodiesel; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA

The mixing of biodiesel and petroleum diesel is being widely used as an attempt to reduce the emissions of sulfur compounds. These compounds are responsible for pollution, causing several diseases, as some breath problems. Sulfur compounds cause car catalyst poisoning and deactivation of processing, contributing with undesirable emissions of other toxic compounds. The goal of this work was to identify sulfur compounds in diesel and in some biodiesel mixtures of different sources. Gas chromatography system coupled with FID (flame ionization detector) was the methodology initially employed, for adjustment of the operational conditions, since FID is a low selectivity detector capable of identifying sulfur compounds and the majority of hydrocarbons. For the sulfur identification, a selective detector for sulfur compounds was employed (SCD - sulfur chemiluminescence detector). After the initial tests realized in the lab, analyses were carried out in a typical Brazilian urban bus fleet, to quantify the presence of mercaptans. The bus was fueled with pure diesel and with different biodiesel blends (v v) of 2% (B2), 5% (B5), 10% ( B10) and 20% (B20). The samples were collected from a real bus in use. Obtained results showed that the addition of biodiesel decreases proportionally the presence of sulfur compounds