In this section, bio-ethanol is obtained from raw materials that are rich in starch (soft wheat and corn). In this case, it is necessary to treat the starch by a hydrolysis reaction to make the glucose contained in it fermentable.

Wheat and maize grains are crushed and dehydrated to obtain starch paste. Starch is then gelated directly at a temperature of 175°C and a pressure of 2 atm. The hydrolysis is generally carried out using an enzyme called amylase, which has the ability to free the glucose molecules that are present in the starch chains. The temperature at which hydrolysis is carried out should be maintained below 60°C

for a fermentable sugar yield of 80%. The remaining part of the starchy section is similar to the sacchariferous section [2, 30].