کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
686786 1460076 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Alcohol effect on microwave-ultrasound enhanced transesterification reaction
ترجمه فارسی عنوان
اثر الکل بر روی مایکروویو-اولتراسوند بهبود واکنش ترانس اکسیداسیون
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
چکیده انگلیسی


• Effect of alcohols in simultaneous microwave/ultrasound irradiations was evaluated.
• Under MW/US transesterification reaction, methanol provides better biodiesel yields.
• Yields were higher for the MW/US reactions compared to MW or US individually.
• Optimum power density must be identified for energy-efficient biodiesel production.

The effect of alcohol on transesterification of used vegetable oil under simultaneous microwave and ultrasound irradiations was studied. Ethanol or methanol was used as an alcohol. The synergistic effect of microwaves and ultrasound was evaluated and compared through a series of experimental studies. A molar ratio of 9:1 (alcohol to oil) was found to be optimum for both ethanol and methanol with approximately 98% and 96% biodiesel yields respectively. Similarly, a catalyst weight of 0.75% resulted in maximum biodiesel yields of 97% and 96% for methanol and ethanol respectively. A reaction time of 2 min was adequate for the transesterification reaction either using methanol or ethanol as a reactant. Higher reaction time severely affected the biodiesel yields when ethanol was used as a reactant. The synergistic effect studies showed that an equal rate of microwave and ultrasound exposure resulted in higher biodiesel yields for both reactants while ethanol produced superior results when microwaves or ultrasound irradiations were used as energy sources individually. There were more polyunsaturated fatty acids in the biodiesel composition for FAMEs compared to FAEEs. Power density tests optimized energy utilization by matching the energy output rates and the reaction volumes for transesterification reaction.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering and Processing: Process Intensification - Volume 101, March 2016, Pages 1–7
نویسندگان
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