I am no expert on this subject, and I have never made my own biodiesel, so I hope that this makes sense. The process known as ultrasonication can process a biodiesel yield of 99% in five minutes, significantly faster than other methods. What is at work here is cavitation, "the formation, growth and implosive collapse of bubbles in a liquid." The conventional method of producing biodiesel is by "the base-catalyzed transesterification of fatty acids from vegetable oils or animal fast with methanol in a batch reactor using heat and mechanical mixing energy as energy inputs", and produces Glycerol as a byproduct. Utrrasonication replaces this action, lowering the costs while speeding up the process. For a more detailed explanation, click here and here.

[Source: Green Car Congress]

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