AP-31 Starch Conversion Jet Cooker – Grain Ethanol ©PSX2010 AP31 12/08 Application: PSX Jet Cooker - Ethanol Production - Starch Liquefaction Ethanol (ethyl alcohol or grain alcohol) is produced through a liquefaction process whereby a starch is converted to a sugar, which is then converted to an alcohol product referred to as ethanol. Ethanol production requires a starch (corn, wheat, rye) based feedstock to supply the conversion process. The grain mash must go through a cook process, to raise the slurry’s temperature. In the Primary Liquefaction Stage, slurry is then pumped through a pressurized jet cooker at 221°F and held for 5 minutes. The mixture is then cooled by an atmospheric or vacuum flash condenser. After the flash condensation cooling, the

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