LCO, Laboratório de Catálise e Oleoquímica, Faculdade de Química, UFPA, Belém, Pará, Brazil.
Magn Reson Chem. 2013 Feb;51(2):69-71. doi: 10.1002/mrc.3913. Epub 2012 Dec 7.
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.
利用 1H NMR 光谱法测定了在水滑石型催化剂存在下用甲醇对大豆油进行酯交换制取生物柴油过程中甲酯、游离甘油和酸值的含量。考察了反应温度和时间等参数对大豆油甲酯转化率的影响。在 1∶12 的醇油摩尔比下，反应温度为 100～180℃，时间为 20～240 min。在 180℃/240 min 的条件下，甲酯的收率达到 94.5wt%，且未检测到游离甘油和游离脂肪酸。
