Alkaline Conventional and in Situ Transesterification of Cottonseed Oil for the Production of Biodiesel
Alkaline Conventional and in Situ Transesterification of Cottonseed Oil for the Production of Biodiesel
复制标题
棉籽油碱性常规和原位酯交换生产生物柴油
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
V. Gergis
中科院分区：
文献类型：
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作者：
K. G. Georgogianni;M. Kontominas;P. Pomonis;D. Avlonitis;V. Gergis
本文研究了在碱性催化剂(NaOH)存在下，采用低频超声(24 KHz)和机械搅拌(600rpm)对棉籽油与甲醇和乙醇的酯交换反应制备生物柴油进行了研究。考察了传统的酯交换反应和原位酯交换反应。在传统的甲醇酯交换反应中，采用超声波作用，反应时间短(20min)，甲酯的产率高达95%，与机械搅拌反应相似。较高浓度的氢氧化钠(2.0%)有较高的酯产率。在传统的乙醇酯交换反应中，使用超声波的产率与使用机械搅拌的产率相似，但明显低于使用甲醇的产率。在原位酯交换反应中，使用超声波和机械搅拌，在大约20分钟的反应时间后，甲酯的产率相似(95%)。在乙醇存在的情况下，超声波的使用导致了高密度脂蛋白的产生。
In the present work, the transesterification of cottonseed oil with methanol and ethanol, in the presence of alkali catalyst (NaOH), using low-frequency ultrasonication (24 KHz) and mechanical stirring (600 rpm) for the production of biodiesel fuel was studied. Both conventional and in situ transesterification were investigated. Use of ultrasonication in conventional transesterification with methanol gave high yields of methyl esters (95%) after a short reaction time (20 min) similar to those using mechanical stirring. Higher concentrations of NaOH (2.0%) gave higher ester yields. Use of ultrasonication in conventional transesterification with ethanol gave similar yields to those using mechanical stirring but significantly lower than respective yields using methanol. In the in situ transesterification, the use of ultrasonication and mechanical stirring led to similar high yields (95%) of methyl esters after approximately 20 min of reaction time. In the presence of ethanol, use of ultrasonication led to hi...