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首页> 外文期刊>Fuel >Synthesis of biodiesel from edible and non-edible oils in supercritical alcohols and enzymatic synthesis in supercritical carbon dioxide
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Synthesis of biodiesel from edible and non-edible oils in supercritical alcohols and enzymatic synthesis in supercritical carbon dioxide

机译：在超临界醇中由食用和非食用油合成生物柴油，并在超临界二氧化碳中酶促合成

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Biodiesel is an attractive alternative fuel because it is environmentally friendly and can be synthesized from edible and non-edible oils. The synthesis of biodiesel from edible oils like palm oil and groundnut oil and from crude non-edible oils like Pongamia pinnata and Jatropha curcas was investigated in supercritical methanol and ethanol without using any catalyst from 200 to 400 ℃ at 200 bar. The variables affecting the conversion during transesterification, such as molar ratio of alcohol to oil, temperature and time were investigated in supercritical methanol and ethanol. Biodiesel was also synthesized enzymatically with Novozym-435 lipase in presence of supercritical carbon dioxide. The effect of reaction variables such as temperature, molar ratio, enzyme loading and kinetics of the reaction was investigated for enzymatic synthesis in supercritical carbon dioxide. Very high conversions ( ＞ 80%) were obtained within 10 min and nearly complete conversions were obtained at within 40 min for the synthesis of biodiesel in supercritical alcohols. However, conversions of only 60-70% were obtained in the enzymatic synthesis even after 8 h.
机译：生物柴油是一种有吸引力的替代燃料，因为它对环境友好，可以由食用油和非食用油合成。在200至400℃不使用任何催化剂的情况下，在200至400℃的温度下，对棕榈油和花生油等食用油以及松果，蓬蒿和麻疯树的粗制非食用油合成生物柴油进行了研究。在超临界甲醇和乙醇中研究了影响酯交换反应转化率的变量，例如醇与油的摩尔比，温度和时间。在超临界二氧化碳的存在下，生物柴油也可以用Novozym-435脂肪酶酶促合成。对于超临界二氧化碳中的酶促合成，研究了反应变量如温度，摩尔比，酶负载和反应动力学的影响。在10分钟内获得了非常高的转化率（> 80％），在40分钟内获得了近乎完全的转化率，用于在超临界醇中合成生物柴油。然而，即使在8小时后，在酶促合成中也仅获得60-70％的转化率。

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