Transesterification of waste frying oil under ultrasonic irradiation (original) (raw)

TRANSESTERIFICATION OF BIODIESEL FROM WASTE COOKING OIL USING ULTRASONIC TECHNIQUE

The aim of this research is to explore a new transesterification process from waste cooking oil to biodiesel using ultrasonic technique. The conversion of waste cooking oil with sodium hydroxide as catalyst used ultrasonic type of clamp on tubular reactor at 20 kHz. The reaction time, molar ratio, and biodiesel quality of this process were compared with conventional transesterification. Method analyzed a total glycerol and free glycerol was determined with Gas Chromatography referred to EN 14105 and functional group of fatty acid methyl ester (FAME) used Attenuated Total Reflection Infrared Spectroscopy (ATR-IR) instruments. At the results, with presence of cavitation on the ultrasonic, chemical activity was increased so that the rate of ester formation is significantly enhanced. The ultrasonic technique could reduce the transesterification reaction time to 5 minute compared to 2 hours for mechanical stirring processing. Conversion of triglyceride (TG) to FAME using ultrasonic obtained 95.6929%wt with the methanol to oil molar ratio of 6:1 and 1%wt sodium hydroxide catalyst.

Emerging Trends in Chemical Engineering Application of Ultrasound for Synthesis of Biodiesel

The aim of study is to synthesize a biodiesel from soybean oil using ultrasonic process. At present, biodiesel is produced in batch reactors in which the required energy is provided by heating by mechanical mixing. Alternatively, ultrasonic processing is an effective way to attain required mixing providing the necessary activation energy. Ultrasonic is a very desirable tool for producing biodiesel from vegetable oil and animal fats, because it lowers the cost of processing, speeds up transesterification, does not require elevated temperatures, and produces a higher grade of biodiesel. The aspect considered in the research work is to develop and design a methodology for ultrasonic process. Hence, our main aim is to study the effect of ultrasonic irradiation on the production of biodiesel from soyabean oil with homogeneous catalysts (KOH). Different operational parameters affecting the biodiesel yield, including methanol/oil molar ratio, catalyst type and concentration, reaction time, and ultrasound pulsation rate were evaluated.

Kinetic Study on Ultrasound Assisted Biodiesel Production from Waste Cooking Oil

Journal of Engineering and Technological Sciences, 2015

The objective of this research was to study a kinetic model of biodiesel production from waste cooking oil assisted by ultrasound power. The model considered the biodiesel production process as a 2 nd order reversible reaction, while its kinetic parameters were estimated using MATLAB, based on data extracted from Hingu, et al. [1]. The data represented experiments under low-frequency ultrasonic wave (20 kHz) and variations of temperature, power, catalyst concentration, and alcohol-oil molar ratio. Statistical analysis showed that the proposed model fits well to the experimental data with a determination coefficient (R 2 ) higher than 0.9.