Open AccessDetermination of Free Fatty Acid by FT-NIR Spectroscopy in Esterification Reaction for Biodiesel Production
Author(s) -
Djéssica Tatiana Raspe,
Camila da Silva
Publication year - 2013
Publication title -
journal of energy
Language(s) - English
Resource type - Journals
eISSN - 2356-735X
pISSN - 2314-615X
DOI - 10.1155/2013/301647
Subject(s) - oleic acid , biodiesel , partial least squares regression , soybean oil , biodiesel production , chemistry , fatty acid , calibration , chromatography , acid value , matrix (chemical analysis) , spectroscopy , organic chemistry , catalysis , mathematics , food science , biochemistry , statistics , physics , quantum mechanics
This work reports the use of FT-NIR spectroscopy coupled with multivariate calibration to determine the percentage of free fatty acids (FFA) in samples obtained by the esterification of FFA in vegetable oils. The analytical method used as calibration matrix samples of the reaction medium of esterification of oleic acid in soybean oil in proportions of 0.3 to 40 wt% (by weight) of oleic acid obtained under different experimental conditions and utilized the partial least squares (PLS) regression. The efficiency of the method was tested to predict the content of FFA in reactions of esterification of oleic acid in soybean oil catalysed by KSF clay and Amberlyst 15 commercial resin, both in a batch mode. Good Correlations were observed between the FT-NIR/PLS method and the reference method (AOCS). The results confirm that FT-NIR spectroscopy, in combination with multivariate calibration, is a promising technique for monitoring esterification reaction for biodiesel production
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