ethanol corn
TRANSCRIPT
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Proprietary and Confidential Copyright 2007 Pavilion Technologies
Ethanol From Corn Process
Dry Mill Ethanol Process Lina M Rueda
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The Distillery Flow Diagram: From Corn to Ethanol Plus Co-products
1 bushel
of corn(56 lbs)
Starch(32 lbs)
Milling
Fermentablesugar
(36 lbs)
Liquefaction
Saccharification
Ethanol
(17.6 lbs)
+DDGS
(17 lbs)
+Heat
(7450 BTU)
+
CO2(18.4 lbs)
Fermentation
Recovery
Dryhouse
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Fermentation Fundamentals
Key Ingredients
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Starch (sugar source)- Enzymes (breakdown of starches)
- Yeast (conversion of sugar to ethanol)
Key Process Components- Enzyme addition
- Yeast propagation
- Fermentation cycle
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Cooling system
EnergyCOOHHCOHC 2556126
22
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Process Description Milling
Cooking and mixing
-Milled corn and cook water
- a-Amylase to break down long polymer chains (starch), reduce solids
- Solubilization of sugars
- Release of bound sugars: starch is bound to protein and fiber which is
released during cooking
- Gelatinization: absorb water so enzymes can react with molecules
Liquefaction
- Using a-Amylase to break down starches to shorter chain molecules
Saccharification and Fermentation
-Batch processs (~ 50-60 hours)
- Exothermic
- Glucoamylase is used to break down short chained molecules to glucose
- Yeast is added to convert glucose to ethanol
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Water Balance
Methanator
Slurry Tank
Process Water
Liquefaction
Backset
Beer Feed
Milling
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Fermentation
Slurry TankLiquefaction
Backset
Beer Feed
FermenterYeast Propagation
Enzymes
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Distillation
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Separate Ethanol from non-fermentable components Dehydration
- Azeotropic Distillation
- Molecular Sieves
Non-Fermentables- Centrifugation
- Evaporation
- Drying
Process Description
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Distillation
Beer Feed
Evap. Steam
Steam Flow
Sieve BackPressure
Rectifier Reflux Sieve Feed
Vaporizer Temperature
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Dryer, Evaporator and TO
Steam Flow
Centrifuge Feed
Whole Stillage
Thin Stillage
Syrup Tank
Wet Cake
Pad
Evaporators
Dryers
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Control Strategy
Ethanol Plant-Wide Optimizer
Dryer Evap TOAPC&
Distill/Sieve APC
Fermentation APCSlurry/WaterbalanceAPC
Mv setpointsPlant and constraintMeasurements (CV)
Energy,feedstock,ProductValues
$ costs