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Ultrasound assisted solvent extraction and pressure assisted solvent extraction are two modern techniques employed in the field of bioenergy conversion for the recovery of valuable bioactive compounds, oils, and other energy-rich components from biomass. Both methods aim to enhance extraction efficiency, reduce solvent consumption, and minimize energy inputs compared to conventional extraction techniques. However, they differ significantly in their working principles, operating mechanisms, and applications. Ultrasound assisted solvent extraction (UASE) relies on the use of ultrasonic waves, typically in the frequency range of 20–100 kHz, to enhance the penetration of solvents into the biomass matrix. When ultrasonic waves pass through the liquid medium, they create alternating high-pressure and low-pressure cycles leading to the formation, growth, and collapse of microscopic bubbles, a phenomenon known as acoustic cavitation. The collapse of these bubbles generates localized microturbulence, high shear forces, and _________ _________ _____ __________ ____ _________ ___ _______ _____ ______ _______.
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