超音波照射によるトリオレインとエタノールのエステル交換反応に与えるモル比，触媒濃度および温度の影響

Abstract

The transesterification of triolein with ethanol to make biodiesel fuel was investigated under ultrasonic irradiation to evaluate the effects of the amount of base catalyst (NaOH or KOH), molar ratio of ethanol to triolein, and temperature. Transesterifi cation of triolein with ethanol readily proceeded under 40 kHz ultrasonic irradiation and the most suitable condition at 25 C was a molar ratio of ethanol/triolein of 6/1, base catalyst concentration of 1 wt for both NaOH and KOH, and reaction time of less than 20 min. In addition, the effect of temperature on the ethanolysis of triolein was investigated. The apparent activation energy estimated under ultrasonic irradiation was almost the same as that reported under stirring. The present results suggest that ultrasonic cavitation provides effective emulsification of triolein and ethanol, resulting in higher rate of transesterification reaction compared with that under stirring.

Two-step Biodiesel Production from Crude Jatropha curcas L. Oil Using Ultrasonic Irradiation Assisted

“…In addition, the emulsion droplets would be smaller under ultrasonic irradiation. Smaller emulsion droplets will result increased contract surface area between the immiscible phases 21 . Thus, the use of ultrasonic irradiation in both phases simultaneously enhances the rate of reaction as well as shifting the equilibrium and resulting in higher conversion to biodiesel.…”

Ultrasound-assisted Synthesis of Biodiesel from Crude Cottonseed Oil Using Response Surface Methodology

“…Similar to the conventional method, variables such as the methanol/oil molar ratio, reaction time, and the catalyst concentration have a significant effect on the biodiesel yield. To determine the optimal condition, Hanh et al 12) evaluated these variables by transesterifying triolein with ethanol under ultrasonic irradiation. The optimal conditions were then identified.…”

Optimization of Biodiesel Production from Cottonseed Oil by Transesterification Using NaOH and Methanol

“…Similarly, in some literature the molar ratio of 6:1 was found to be the best conversion efficiency in transesterification of such oils using an alkali catalyst (Marchetti et al, 2007). Many scientists have studied the effect of catalyst amount on the conversion of oils or fats to FAME by transesterification (Freedman et al, 1984;Nye et al, 1983;Mittelbach and Trathnigg, 1990;Tomasevic and Siler-Marinkovic, 2003;Hanh et al, 2007;Felizardo et al, 2006). In general, they found that 0.3-1% alkali catalyst concentration resulted in successful conversion depending on the type of oil used.…”