Bioethanol is produced in a biorefinery through the fermentation process of sugars from cereals, resulting in this renewable alcohol.
Any type of agricultural material that contains starch can be introduced into the plant as raw material.
This raw material is first cleaned and crushed. Subsequently it is heated and moistened, to be treated with enzymes so that the starch becomes sugars. These sugars will then be fermented, by the addition of yeasts, turning sugars into alcohol in this process.
The bioethanol obtained is distilled obtaining a bioethanol of great purity and the remaining vinasses are treated and dried to obtain both animal feed rich in DDGS proteins and corn oil.
Vertex Bioenergy production plants also can produce bioethanol from wine alcohol by means of a distillation process. The bioethanol produced from this agricultural residue present even greater GHG emissions reduction and benefits of the double-counting category for the European Commission sustainability objectives accounting.
During the fermentation process CO2 is produced, which is extracted and captured for other uses, reducing the overall process emissions.
Some of the heat generated in the drying of DDGS is also used to produce electricity in a cogeneration process. This electricity is renewable and is sold to the grid.