A method and system for reducing the unfermentable solids content in a proteinportion,via a counter current wash, at the back end of a corn dry milling process formaking alcohol isdisclosed. The method can include separating the whole stillage byproduct intoan insolublesolids portion and a stillage (centrate) portion, which includes protein.Thereafter, the stillageportion can be separated into a water soluble solids portion and a proteinportion. The proteinportion may be mixed with clean water to wash and dilute the protein portion.The dilutedprotein portion may be dewatered to form a dewatered protein portion and acentrate. A portionof the centrate may be used as a protein counter current wash when the proteinportion is beingseparated from the stillage portion. The protein counter current wash reducesthe amount ofunfermentable solids in the protein portion and the centrate.
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