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Ultrasonic Oil Extraction 5

A promising Low cost commercial oil extraction.

I have discussed with a physics professor regarding the ultrasound. I think this method of oil extraction is having good scope and low cost.

Intense sonication of liquids generates sound waves that propagate into the liquid media resulting in alternating high-pressure and low-pressure cycles. During the low-pressure cycle, high-intensity small vacuum bubbles are created in the liquid. When the bubbles attain a certain size, they collapse violently during a high-pressure cycle. This is called cavitation. During the implosion very high pressures and high speed liquid jets are produced locally. The resulting shear forces break the cell structure mechanically and improve material transfer. This effect supports the extraction of lipids from algae.
The table to the right shows typical power requirements for various volume flows. The ultrasonic system is generally integrated inline. The ultrasonication reactor can be easily retrofitted into existing facilities, improving algae extraction.

The application of ultrasonication to the production of biodiesel from algae is not limited to the extraction of oil from algae. Biodiesel is made from algae oil by a chemical conversion process called transesterification. Despite the use of heat, mechanical agitation and catalytic chemicals, this conversion takes approx. 4 to 6 hours. Ultrasonication improves the mixing and increases the chemical reactivity of the reactants. This reduces the time needed for the chemical conversion by up to 90% leading to a whole new perspective on biodiesel making. Instead of pumping from batch to batch, the reactants are mixed continuously and subsequently pumped through a reactor column. A residence time of approx. 1 hour is sufficient for the conversion to complete. A centrifuge separates the glycerin from the biodiesel. After washing and drying of the biodiesel, it is ready to be used. Other benefits include a more complete transesterification of the tri-glyceride molecules, meaning that more oil is actually converted into biodiesel. Also, it requires less alcohol and catalyst - reducing production costs and improving the environmental effect
Sat May 08 2010 09:31:14 AM by Kumar Ultrasonic Oil Extraction 2683 views

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