Transesterification,
The oil filtered is triglycerides, containing glycerine. The biodiesel process turns the oils into esters, separating out the glycerine. The glycerine sinks to the bottom and the biodiesel floats on top and can it could be got for the biodiesel oil .
The process is called transesterification, which substitutes alcohol for the glycerine in a chemical reaction, using lye as a catalyst.
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