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首页> 外文期刊>Energy Conversion & Management >Optimization of non-catalytic transesterification of tobacco (Nicotiana tabacum) seed oil using supercritical methanol to biodiesel production
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Optimization of non-catalytic transesterification of tobacco (Nicotiana tabacum) seed oil using supercritical methanol to biodiesel production

机译：利用超临界甲醇优化生物柴油生产中烟草（Nicotiana tabacum）种子油的非催化酯交换反应

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The biodiesel production from non-edible oils has high potential as renewable and ecological fuel. Few researches have been conducted to date on the production of biodiesel from tobacco (Nicotiana tabacum) seed oil. The aim of this study was to optimize the biodiesel production from this crude oil by non catalytic supercritical methanolysis using response surface methodology (RSM). Triglyceride conversion, total and individual FAME yield, monoglyceride and diglyceride yield, and thermal decomposition degree of biodiesel were determined in the temperature and reaction time ranges of 250-350 degrees C (12-43 MPa) and 15-90 min, respectively, at a fixed methanol-to-oil molar ratio of 43:1. According to the RSM, the optimal conditions were 303.4 degrees C and 90 min, reaching a predicted maximum FAME yield of 91.1 +/- 3.2 mol%. This maximum was very close to that obtained experimentally (92.8 +/- 2.1 mol%) at 300 degrees C and 90 min. Decomposition of biodiesel became evident at 325 degrees C and 60 min of reaction due to the thermal instability of unsaturated methyl esters (methyl linoleate and oleate). The biodiesel obtained in the best experimental reaction conditions (300 degrees C and 90 min), where no thermal decomposition of FAMEs was observed, contained most of the byproduct glycerol generated, which was degraded and incorporated to the product. This biodiesel basically failed to meet the content of FAMEs as required by the standard EN 14214, the content of monoglycerides and total glycerol, and the acid value, being a little above the required upper limits. However, this biodiesel can be blended with other biodiesels of complementary features to produce a biofuel meeting the requirements of the standard EN 14214. (C) 2016 Elsevier Ltd. All rights reserved.
机译：由非食用油生产的生物柴油具有可再生和生态燃料的巨大潜力。迄今为止，关于从烟草（Nicotiana tabacum）种子油生产生物柴油的研究很少。这项研究的目的是通过使用响应面方法（RSM）通过非催化超临界甲醇分解来优化该原油的生物柴油生产。分别在250-350摄氏度（12-43 MPa）和15-90分钟的温度和反应时间范围内分别测定甘油三酸酯的转化率，FAME的总和单独产率，甘油单酯和甘油二酯的产率以及生物柴油的热分解度。固定的甲醇与油的摩尔比为43：1。根据RSM，最佳条件为303.4摄氏度和90分钟，达到预计的最大FAME产率为91.1 +/- 3.2摩尔％。该最大值非常接近在300℃和90分钟下通过实验获得的最大值（92.8 +/- 2.1mol％）。由于不饱和甲酯（亚油酸甲酯和油酸酯）的热不稳定性，在325摄氏度和60分钟的反应中，生物柴油的分解变得很明显。在最佳实验反应条件（300摄氏度和90分钟）下获得的生物柴油中，未观察到FAME的热分解，其中包含生成的大部分副产物甘油，这些副产物甘油被降解并掺入到产品中。该生物柴油基本上不能满足标准EN 14214所要求的FAME含量，单甘油酯和总甘油含量以及酸值，均略高于所需上限。但是，可以将该生物柴油与其他具有互补功能的生物柴油混合，以生产符合标准EN 14214要求的生物燃料。（C）2016 Elsevier Ltd.保留所有权利。

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