Physico-chemical analysis of biodiesel obtained from blends of virgin castor oil and waste frying oil

Abstract

Renewable fuels production got a big boost in recent years. One alternative is the production of vegetable oils with the ability to replace all or partly the diesel fuel derived from oil. The objective of this work was to produce biodiesel from blends of virgin castor oil (VCO) and waste frying oil (WFO) from ethylic route and alkaline catalysis as well as to study the physical and chemical properties. Biodiesel was obtained from 5 different raw materials: VCO (B1), WFO (B2) and three different blends (B3: 50%VCO+50%WFO; B4:25%VCO+75%WFO; B5:75%VCO+25%WFO). The raw materials were evaluated by acidity level, free fatty acids, saponification index and density. For the biodiesel, the index of iodine, cetane, glycerin, absence of triglycerides and rheology was determined. According to the results, all samples were within the specified standard for iodine index and density, but B1 biodiesel showed viscosity and cetane number not allowed in the legislation. Despite the fact thatB4 and B5 results were within the legislation for biodiesel, B4 would be a better alternative due to higher quantity of WFO.

Análise De Desempenho Do Transformador De Potência Isolado a Óleo Vegetal Em Relação Ao Transformador De Potência Isolado a Óleo Mineral

“…No entanto, devido à crise do mercado de petróleo nos anos 1970, surgiu um novo estímulo: buscar fontes biodegradáveis alternativas para aplicação em transformadores. Por volta do ano de 1999 foram desenvolvidos OVIs apropriados para a aplicação em transformadores de potência (FEIL et al, 2017;GUIMARÃES et al, 2019;STOCCO, 2010;WILHELM;TULIO;UHREN, 2009). A partir disso, diversas distribuidoras de energia elétrica brasileiras têm substituído transformadores a OMI por transformadores a OVI não só em suas redes de distribuição, mas também em subestações.…”