No abstract

Brazil has emerged as producer of alternative fuels derived from biomass, such as biodiesel, which can replace fossil diesel and is less polluting. However, there is a concentration of income in the production chain, since most of the biodiesel produced in the world is derived from soy oil from major producers. This scenario also corresponds to Brazil, and Tocantins state could not frame in the National Program for Biodiesel Production. In this study, the biodiesel was produced from beef tallow obtained from slaughterhouses in the city of Gurupi-TO. The beef tallow was characterized in its raw state, processed and then the biodiesel was synthesized. We studied the oxidation stability through spectroscopic analysis in the UV-vis, and we observed their stability to oxidation via spectroscopic analysis in the UV-vis, and observed that the beef tallow biodiesel showed increased absorption in 234 nm and 268 nm after reduction in oxidative stress. We checked an early stage of oxidation after the seventh day with the maximum concentration of primary oxidation compounds. We obtained a satisfactory biodiesel within some of the parameters of the National Agency of Petroleum, Gas Naturale Biofuels (ANP).

Biodiesel is a fuel derived from renewable raw materials with the potential to change the world's energy matrix, and reduce the damage caused by fossil fuels to the environment and human health. The disadvantage of biodiesel is its low oxidative stability which affects its storage time. In this study, experimental biodiesel blends were used to identify the influences of carotenoid and free fatty acid contents on storage stability by using UV-VIS spectroscopy. Binary biodiesel blends were prepared blending buriti biodiesel contents ranging from 30% (v/v), 60% (v/v), and 90% (v/v) with soybean, sunflower, and beef tallow biodiesel. The blends were stored up to 45 days to compare the oxidative stabilities. The binary biodiesel blend composed by 90% buriti biodiesel and 10% beef tallow one presented the highest oxidative stability during the evaluated storage time.

The use of waste for energy production through processes like pyrolysis, combustion and oil extraction is a sustainable solution to serious environmental problems like centralization of the energy matrix in nonrenewable materials and pollutants and the volume of urban solid waste. In this context, this work aimed to analyze the energy potential of two solid waste biomasses: municipal slaughter sludge and wood sawdust generated in the city of Gurupi –TO. Were evaluated the contents of humidity, volatile content, ash, fixed carbon through the immediate analysis and upper (PCS) and lower (PCI) calorific value were evaluated for all samples collected. In the immediate analysis it was found that the sludge sample had higher ash content than the sawdust and both had high volatile contents. The sawdust presented higher calorific power (4882 cal kg-1) than the sludge (3952.5 cal kg-1), but the process of obtaining energy from the sludge requires less heat. It can also be concluded that both materials present viable alternatives for obtaining energy.