Abstract
The high cost of biodiesel production is mainly linked to the price of raw material.This factor has favored the use of alternative fats and oils such as those used in frying. Since biodiesel can be obtained from several vegetable and animal raw materials, the physicochemical characteristics of the fuel may vary considerably. One of these characteristics is the fatty acid composition. It directly affects the oxidative stability of biodiesel, which can be impaired when the fuel undergoes exposure to sunlight, metals, oxygen and high temperatures. In order to improve the oxidative stability of biodiesels produced from waste frying oil some studies involving blends of different raw materials have been carried out. In this sense, this work aimed to assess the characteristics resulting from the blending of soybean waste frying oil with other waste biodiesels in what concerns to oxidation. The blends of fatty materials were obtained by means of a 2² factorial design. The induction periods of biodiesel blends were enough to meet the ASTM D6751 standard. Swine fat was responsible for the increase in the induction period values.
Highlights
Due to various factors, such as the price of raw materials and production costs, biodiesel does not compete economically with its fossil similar (Ong, Mahlia, Masjuki, & Honnery, 2012)
This study aims to assess the oxidative stability resulting from the blending of soybean waste frying oil with other waste biodiesels
The high conversion rate of the transesterification process emphasizes that less noble raw materials can be used without further issues, provided that they are at least subjected to some type of filtering/cleaning process
Summary
Due to various factors, such as the price of raw materials and production costs, biodiesel does not compete economically with its fossil similar (Ong, Mahlia, Masjuki, & Honnery, 2012). In order to reduce these costs, alternative raw materials, such as waste frying oils, have been used (Aghabarari, Dorostkar, & Martinez-Huerta, 2014; Cremonez et al, 2015). Soybean and canola oils stand out for having large amounts of free fatty acids and unsaturated carbon chains (Serrano et al, 2014), which compromise their. The use of raw material whose predominant carbon chains are saturated provides more stable biodiesels, where as mono- and polyunsaturated chains lead to biodiesels that are more prone to oxidation (Serrano et al, 2014).
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