English: In order to produce biodiesel, it is necessary to add an excessive amount of methanol. Once the bio fuel is produced it is required to recover the excess of alcohol through distillation. Biodiesel with excess of methanol are heated in a distiller to remove the alcohol. The bubbles indicate a successful separation of the two substances.
Experiments made in the Key laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology. Huazhong University of Science and Technology, Wuhan, People's Republic of China
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