Solid-Acid-Catalyzed Esterification of Oleic Acid Assisted by Microwave Heating

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• 作者：Carlos A. R. Melo Jnior ; Carlos E. R. Albuquerque ; Juliana S. A. Carneiro ; Claudio Dariva ; Montserrat Fortuny ; Alexandre F. Santos ; Silvia M. S. Egues ; Andr L. D. Ramos
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：December 1, 2010
• 年：2010
• 卷：49
• 期：23
• 页码：12135-12139
• 全文大小：146K
• 年卷期：v.49,no.23(December 1, 2010)
• ISSN：1520-5045

文摘

This work aims to evaluate the activity and stability of solid acid catalysts (niobium oxide and sulfated zirconia) in the methyl esterification of oleic acid assisted by microwave heating, an alternative route to the base-catalyzed transesterification reaction using conventional heating. Both catalysts have yielded similar conversions (68% for Nb<sub>2sub>O<sub>5sub> and 68.7% for sulfated zirconia at 200 °C, t = 20 min, methanol-to-fatty acid molar ratio = 10, 5% w/w catalyst), much higher than the one obtained without catalyst (39.3%), besides a small deactivation after the fourth use (3% for Nb<sub>2sub>O<sub>5sub>, 11% for sulfated zirconia, compared to the first use). The results have not indicated a pronounced increase on reaction conversions by using microwave heating when compared to conventional data found in the literature. However, microwave irradiation remains attractive for heating esterification systems, since it allows for achieving high temperatures at reduced times.