AP-40 Starch Processing Corn Wet Milling ©PSX2010 AP-40 12/080212 Primary Liquefaction - Starch Cooking Process After the steeping and separation process, the starch is physically and chemically prepared for fermentation. The milled grain is mixed with process water, the pH is adjusted to about 5.8, and an alpha-amylase enzyme is added. The grain mash must go through a cook process, to raise the slurry’s temperature. In the Primary Liquefaction Stage, slurry is then heated with a pressurized jet cooker at 221°F – 228°F. The mixture is then cooled by an atmospheric or vacuum flash condenser and then the mixture is held for 1–2 hours at 180–190°F to allow the enzymes time to work. Previous First generation jet cookers suffered from various issues: ! Poor alignme

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