Soybean biodiesel methyl esters,free glycerin and acid number quantification by 1H nuclear magnetic resonance spectroscopy |
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Authors: | Natasha Coral Elizabeth Rodrigues Victor Rumjanek José Roberto Zamian Geraldo Narciso da Rocha Filho Carlos Emmerson Ferreira da Costa |
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Institution: | 1. LCO, Laboratório de Catálise e Oleoquímica, Faculdade de Química, UFPA, , CEP: 66075‐110 Belém, Pará, Brazil;2. ICEN, Instituto de Ciências Exatas e Naturais, , CEP:66075‐110 Belém, Pará, Brazil;3. Departamento de Química, UFRRJ, , CEP 23890‐000 Seropédica, Rio de Janeiro, Brazil |
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Abstract: | 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. 1H 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. |
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Keywords: | NMR 1H soybean oil transesterification biodiesel methyl esters free glycerin acid number |
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