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Biodiesel production from three mixes of oils with high free fatty content: quality evaluation and variable analysis
Ortiz, E. G.; Quintero, I. & Arévalo, K.
Abstract
Due to the excessive use of fossil fuels around the
world, more environmentally friendly alternatives have been
studied. Technologies for the production of ethanol, biogas
and biodiesel are focusing on the importance of improving
costs and efficiency. Biodiesel can be used in automotive
internal combustion, is biodegradable and has no presence of
metals, however, it lacks competitiveness versus petrodiesel
mainly by the high cost of the pure oils used for its production.
The aim of this study was to obtain biodiesel from oil samples
with high content of free fatty acids (>1 %) obtained from
three fast food restaurants using their molecular weight and
acidity index values in order to neutralize the free fatty acids in
a one-step reaction and perform a screening for optimal conditions
for transesterification. The experimental design consisted
of two reaction times (60 and 90 min); four methanol–
oil molar ratios—6:1, 10:1, 15:1 and 20:1; and two catalysts
(NaOH and KOH) at three concentrations 0.5, 1 and 1.5 %
with a constant temperature of 60 °C and 500 rpm. The
optimum conditions for the different waste cooking oil feedstocks
were established reaching a final yield up to 85.53 %of
biodiesel, concluding that there is viability of production
through the use of this raw material and free fatty acids neutralization
technique, obtaining a biofuel that meets international
quality standards.
Keywords
Alkaline; Recycling; Transesterification; Waste
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