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In this work, fast and efficient analytical methodologies were developed for quality monitoring of the content of jatropha methyl and ethyl biodiesels in blends with mineral diesel, and to monitor the presence of adulterants using mid-infrared (MIR) spectrometry allied to the method of multivariate control charts based on net analyte signal (NAS). The methodology of multivariate control charts consists...
This work describes a study of the purification of biodiesel produced from sunflower oil by dry cold washing using natural adsorbents as cellulose and starch from different sources (corn, potato, cassava and rice), and the comparison with dry cold washing with a commercial adsorbent Select 450® and with the conventional wet washing with hot water. The purification by dry washing was carried out by...
The objective of this work was to differentiate the type of biodiesel in mixtures with diesel in the ratio of 5% (v/v) in relation to the type of oil and alcohol used in the production process of the respective biofuel. For this purpose, the mid-infrared (MIR) spectroscopy combined with supervised chemometric tool, partial least squares discriminant analysis (PLS-DA) was used. The distinction between...
This work quantifies the adulteration of ethyl and methyl soybean biodiesels/diesel (B5) blended with soybean oil using mid-infrared spectroscopy associated with multivariate calibration. The models constructed by the method of partial least squares (PLS) presented low values of root-mean-square error of prediction 0.22 % (w/w) and 0.26 % (w/w), respectively, for models containing ethyl and methyl...
An experiment to establish the best reaction conditions for the transesterification of soybean oil is described. We conducted the ethylic and methylic routes using two different protocols, and evaluated how the variables time, stirring, alcohol/oil molar ratio, catalyst (%), catalyst type, and temperature affected the process. The highest yield of biodiesel was obtained using the following conditions:...
This study evaluated the use of partial-least-squares (PLS) regression models to quantify soybean biodiesels in diesel blends. The study was carried out by taking into account the entire mid-infrared spectral range and according to the ASTM E1655 standard. The PLS models provided low root-mean-squared errors of prediction (RMSEP) of 0.0792% (v/v) and 0.1050% (v/v) for the models containing methyl...
Values of thermal expansion coefficients (b) were experimentally determined for three samples: a mineral diesel and two biodiesels constituted by either fatty acid ethyl esters (FAEE) or fatty acid methyl esters (FAME), from transesterification reactions using raw corn oil and ethyl or methyl alcohol. Values of b were found to be 8.36(±0.06)10 −4 °C −1 , 8.43(±0.09)×10 −4 °C...
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