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Soybean biodiesel methyl esters, free glycerin and acid number quantification by 1 H nuclear magnetic resonance spectroscopy
Author(s) -
Coral Natasha,
Rodrigues Elizabeth,
Rumjanek Victor,
Zamian José Roberto,
Rocha Filho Geraldo Narciso,
Costa Carlos Emmerson Ferreira
Publication year - 2013
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.3913
Subject(s) - biodiesel , transesterification , chemistry , methanol , soybean oil , catalysis , diesel fuel , organic chemistry , biodiesel production , nuclear magnetic resonance spectroscopy , fatty acid methyl ester , fatty acid , vegetable oil , nuclear chemistry , food science
Production of alternative fuels, such as biodiesel, from transesterification of vegetable oil driven by heterogeneous catalysts is a promising alternative to fossil diesel. However, achieving a successful substitution for a new renewable fuel depends on several quality parameters. 1 H NMR spectroscopy was used to determine the amount of methyl esters, free glycerin and acid number in the transesterification of soybean oil with methanol in the presence of hydrotalcite‐type catalyst to produce biodiesel. Reaction parameters, such as temperature and time, were used to evaluate soybean oil methyl esters rate conversion. Temperatures of 100 to 180 °C and times of 20 to 240 min were tested on a 1 : 12 molar ratio soybean oil/methanol reaction. At 180 °C/240 min conditions, a rate of 94.5 wt% of methyl esters was obtained, where free glycerin and free fatty acids were not detected. Copyright © 2012 John Wiley & Sons, Ltd.