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Ethanol from Corn
Sturtevant Simpactor® Pin Mill
Corn Ethanol: Most of the ethanol in the U.S. is presently made from corn, primarily starting with a dry milling process. A wet milling process is also used. Both methods allow the production of ethanol and by-products. The by-products are mainly Animal Feed (DDG), Corn oil (from the Bran), Bran food products and CO2 for the dry process and High Fructose Corn Syrup, Corn Oil, Gluten Feed and Gluten Meal for the wet process. The Sturtevant Simpactor can be used for both the dry and wet processes. For the dry process two separate areas are beneficial, for the wet process one main area. Both dry and wet process applications are described below.
| Applications: |
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• Dry Milling: Before milling the feed stock, the Sturtevant Simpactor can be used to de-germinate/fractionate the whole corn kernel. This pre-milling process will increase the protein content of the DDG by-product used for animal feed increasing its sell value greatly. The Bran is also separated off allowing the oil or bran by-products to be used. What is left is a high starch fraction for more efficient ethanol production.
• Dry Milling: The Sturtevant Simpactor has many advantages (seen below) over the standard “Hammer Mill” grind/milling step done just prior to the cooking. The Simpactor can make your “meal” within a tighter product profile and finer size which can mix with the alpha-amylase more consistently and use less horsepower to do so.
• Wet Milling: After the steeping process large Sturtevant Simpactor pin mills can process the corn prior to screening very efficiently (see below features and benefits). Both operational power and low maintenance are key issues addressed and contained by the Sturtevant Simpactor pin mills. |
How it works:The Sturtevant Simpactor® is a centrifugal, pin-type impact mill. The Simpactor can reduce low-to-medium-density materials to uniform fine particle sizes of 50-200 mesh or take apart feed material components when used at low RPM. Feed is dropped onto the spinning rotor plate where centrifugal force drives it through a set of intermeshing pins and against a corrugated impact ring. This action reduces the size of friable particles via impact, or gently separates the material into fractional parts if used at low RPM.
| Features: |
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• The Simpactor® can be supplied in either carbon steel construction or various stainless steel designs.
• Tungsten carbide pins and ceramic impact liners are available for wear protection.
• Zero bug trap and quick change sanitary units are also available.
• Scheduled bearing lubrication can be done from external fittings. Larger models are equipped with a re-circulating temperature controlled oil tank.
• To minimize nuisance dust, and enhance product throughput the discharge cone contains a ventilation tube for connection to a nuisance dust collector.
• There are no screens to blind in the Sturtevant pin mills.
• Pneumatic or gravity feed is possible via a rotary air lock valve or volumetric feed screw. |
| Benefits: |
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• Due to the vertical shaft design, the product falls through by gravity eliminating material hanging up inside the mill.
• The range of the product particle size is achieved by simply adjusting the rotor speed.
• The rotor acts like a fan pulling in cool air to prevent excessive heat build up.
• Bearings are mounted in a “cartridge” for easy replacement reducing downtime and maintenance costs. |
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