Fiber wash system and method
A system and method for washing and separating fiber in the processing of grains in between the steps of fermentation and distillation is disclosed. Also disclosed is a method for producing a high protein feed.
1 . A system for a dry mill ethanol plant comprising:
a fermentation vessel coupled to a separating means for separating fiber from protein in fermented grain;
a first outlet coupled to the fermentation vessel for routing the fermented grain to the separating means;
a second outlet coupled to the separating means for routing the protein to a distillation column;
a third outlet coupled to the separating means for routing the separated fiber to a solvent wash system;
a fourth outlet coupled to the solvent wash system for routing the fiber to a solvent recovery system; and
a fifth outlet coupled to the solvent recovery system for routing the fiber to a fiber recovery system,
wherein the fiber and the protein are separated in the separating means after fermentation and prior to being routed to the solvent wash system and the distillation column, respectively.
2 . The system of claim 1 , further comprising a sixth outlet coupled to the solvent recovery system for routing the recovered solvent for reuse.
3 . The system of claim 2 , wherein the recovered solvent is routed to a tank for capturing ethanol.
4 . The system of claim 1 , further comprising a washing stream comprising ethanol, wherein the washing stream is coupled to the solvent wash system.
5 . The system of claim 1 , wherein the fiber recovery system comprises a fiber dryer coupled to a fiber storage vessel.
6 . The system of claim 1 , wherein the solvent wash system comprises one or more screens and means of separation connected in series with a counter current wash comprising ethanol.
7 . A system for a dry mill ethanol plant comprising:
a fermentation vessel coupled to a separating means for separating fiber from protein in fermented grain;
a first outlet coupled to the fermentation vessel for routing the fermented grain to the separating means;
a second outlet coupled to the separating means for routing the protein to a distillation column;
a third outlet coupled to the separating means for routing the separated fiber to a solvent wash system;
a fourth outlet coupled to the solvent wash system for routing the fiber to a solvent recovery system; and
a fifth outlet coupled to the solvent wash system for routing the fiber to a cellulosic process,
wherein the fiber and the protein are separated in the separating means after fermentation and prior to being routed to the solvent wash system and the distillation column, respectively.
8 . The system of claim 7 , wherein the solvent wash system comprises one or more screens and means of separation connected in series with a counter current wash comprising ethanol.
9 . The system of claim 7 , further comprising a washing stream comprising ethanol coupled to the solvent wash system.
10 . The system of claim 7 , wherein the cellulosic process is configured to apply one more of pH adjustment, heat, enzyme addition, and fermentation.