1. How Ethanol is Produced By: Josh Bochmann Auto 480-002

2. Past, Present and Future 3. Dry Milling First the grain is ground into flour, often referred to as meal. Next the meal is mixed with water to form a mash. Enzymes are added to this mash to convert the starch from the grain into sugar. The mash is then sent to a high temperature cooker to reduce bacteria levels. After lowering the bacteria levels the mash is cooled and transferred to the fermentation tanks. Yeast is added during to convert the sugar in to ethanol and carbon dioxide. 4. Once fermentation is complete the ethanol is separated from the remaining mash and sent to distillation. The ethanol is distilled and then mixed with 5% gasoline to make it undrinkable. This deters people from catching a buzz at the local fill up station. The remaining mash is sent off to be processed into corn syrup and food for livestock. 5. Wet Milling First the grain is soaked in water and dilute sulfurous acid for 24 to 48 hours. This separates the grain in to its many component parts. The result is a slurry that is then sent through grinders to separate out the germ. The remaining fiber, gluten, and starch are further separated from each other. The starch is then sent to be fermented. The fermentation process is similar to the fermentation process of dry milling The gluten, water, and fiber are further processed to produced feed for livestock and other products. 6. Dry Milling vs Wet Milling Dry Short process time Fairly simple process Low waste production Waste is used for feeding livestock Limited to certain feedstocks Wet Many feedstocks can be used Process is more involved Longer process time More waste produced Waste is used to produce many things 7. Virtual Tours http://vatour- dev.com/system/tours/ascendant/patriot /tourfiles/index.html http://www.ethanol.org/index.php?id=73 8. Sources http://www.ethanolrfa.org/pages/how- ethanol-is-made http://en.wikipedia.org/wiki/Ethanol_fuel#Pro duction_process http://www.thebioenergysite.com/articles/66 4/biofuel-production-greater-shares-of- commodities-used http://econpapers.repec.org/article/agsjloag b/90656.htm http://www.amg-eng.com/blog/corn-wet- milling-vs-dry-milling/