Biologic lipids also require no refining -to produce biodiesel they use a process called transesterification, similar to soap making.

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It employs a process called transesterification, in which the grounds react with an alcohol in the presence of a catalyst.

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High oil-yielding strains of algae can be grown and dried and the oil extracted from the dry algal mass, before being similarly converted to biodiesel in a process called transesterification.

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