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首页> 外文期刊>Journal of the Taiwan Institute of Chemical Engineers >Biodiesel production from coconut oil in supercritical methanol in the presence of cosolvent
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Biodiesel production from coconut oil in supercritical methanol in the presence of cosolvent

机译：在助溶剂存在下，由椰子油在超临界甲醇中生产生物柴油

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The transesterification of coconut oil with supercritical methanol in the presence of cosolvent was carried out in a batch autoclave for production of biodiesel. The transesterification was found to be catalyzed by the surface of the autoclave. However, the catalytic activity of the autoclave dropped with great extent after a certain period of time. A 1.5M oxalic acidic solution could be used to wash the surface to restore the catalytic activity of the autoclave. From the measured yields of biodiesel in a period of 20min, ether was found to be the most effective cosolvent among eight cosolvents tested in this study. The effects of temperature, pressure, molar ratio of methanol to coconut oil, and molar ratio of methanol to cosolvent on methyl esters yield using ether as the cosolvent were examined. A temperature at least 30°C higher than the critical temperature of methanol is essential for obtaining high biodiesel yield. The yield was also found to increase with increasing pressure, however, the extent of increase was reduced when the pressure was higher than 14MPa. The most appropriate molar ratios of methanol to coconut oil and to ether were found to be 30/1/3. These molar ratios were observed invariant when CO _2 instead of ether was used as the cosolvent.
机译：在分批高压釜中，在助溶剂存在下，椰子油与超临界甲醇的酯交换反应用于生产生物柴油。发现酯交换反应被高压釜的表面催化。但是，经过一定时间后，高压釜的催化活性大大降低。 1.5M的草酸溶液可用于洗涤表面，以恢复高压釜的催化活性。从在20分钟内测得的生物柴油收率，发现醚是本研究中测试的八种助溶剂中最有效的助溶剂。以醚为助溶剂，考察了温度，压力，甲醇与椰子油的摩尔比，甲醇与助溶剂的摩尔比对甲酯收率的影响。比甲醇的临界温度至少高30°C的温度对于获得高生物柴油收率至关重要。还发现产率随着压力的增加而增加，但是，当压力高于14MPa时，增加的程度降低了。发现甲醇与椰子油和醚的最合适的摩尔比是30/1/3。当使用CO _2代替醚作为助溶剂时，观察到这些摩尔比是不变的。

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