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Published on: April 19, 2024
Intensification of biodiesel production using dual-frequency counter-current pulsed ultrasound
Xiulian Yin1, Xuejuan Zhang2, Miaomiao Wan2
1Huaiyin Insttute of Technology, School of Life Science and Food Engineering, Huaian, Jiangsu 223003, China; Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, Nanjin Forestry University, Nanjing, Jiangu 210037, China; Jiangsu Provincial Engineering Laboratory for Biomass Conversion and Process Integration, Huaiyin Institute of Technology; Huaian 223003, China.
Abstract:
Biodiesel production from soybean oil deodorizer distillate intensified by dual-frequency counter-current pulsed ultrasound and the kinetics were studied. Results indicated that the biodiesel conversions enhanced by single-frequency were lower than those enhanced by dual-frequency. For dual-frequency, the biodiesel conversion of SMM was higher than those of SQM. The biodiesel conversion of the combination of 20/28kHz is the highest. The effects of 20/28kHz SMM on biodiesel production were studied and optimal conditions were: methanol to triglyceride molar ratio 8:1, catalyst content 1.8%, the water content in feedstock should be less than 0.4%, the acid value of feedstock should be less than 2mgKOH·g-1, the biodiesel conversion could reach 96.3%. The kinetics of SMM and SSPU were studied and results showed that the transesterification reaction was pseudo-second order and the energy activation obtained by SMM and SSPU were 18.122kJ·mol-1 and 26.034kJ·mol-1, respectively. These results showed that transesterification reaction intensified by SMM is easier to take place than SSPU.
