The diagram illustrates the process of producing ethanol fuel from corn.
Overall, there are nine main stages, beginning with the harvesting and storing of corn, and ending with the storage and transportation of purified ethanol. The process involves both mechanical and chemical changes and produces a useful solid by-product.
First, the stored corn is milled into fine particles. Water is then added, and the mixture is cooked for four hours. This is followed by a fermentation process that lasts for 48 hours. After fermentation, the mixture is separated into solid and liquid components. The solid by-product is removed, while the liquid proceeds to the purification stage, which takes five hours.
Finally, the ethanol is stored and transported for further use. Notably, the solid by-product produced during separation can be repurposed for making materials such as paper or packaging, ensuring minimal waste.