Processes for recovering products from a slurry
Improved processes and systems for recovering products from a corn fermentation mash. In some examples, a process recovers an oil product, a protein meal product, and a fiber product from a slurry. A process includes the following steps: introducing the slurry into a device with a flexible screen and mechanical agitation to produce a filtrate and a fibrous solid stream; and introducing the filtrate into a three-phase centrifuge to produce an oil stream, a high protein solids stream, and a water with solubles stream. The flexible screen includes a washing nozzle. The slurry is whole stillage from an ethanol process. The three-phase centrifuge is a three-phase decanter. The filtrate is heated before introducing into the three-phase centrifuge. The filtrate is optionally evaporated before introducing into the three-phase centrifuge.
1. A process for recovering an oil product and a protein meal product from a slurry, comprising:
introducing the slurry into a filter device comprising a flexible screen and a mechanical agitation mechanism to produce a filtrate and a fibrous solid stream, wherein the flexible screen is coupled to the filter device via one or more elastic supports;
separating the filtrate into a high protein solids stream and a solubles stream;
drying the high protein solids stream to produce the protein meal product;
evaporating the solubles stream to produce a condensed solubles stream; and
separating the oil product from the condensed soluble stream.
2. The process of claim 1 , wherein the filter device comprises a washing nozzle inside the flexible screen positioned for counter-current washing of solids contained in the filter device.
3. The process of claim 1 , wherein the slurry is whole stillage from an ethanol process.
4. The process of claim 1 , further comprising:
a rotor positioned inside the flexible screen;
one or more paddles coupled to the rotor, wherein each paddle pulses slurry radially outward against the flexible screen; and
fighting coupled to the rotor, wherein the fighting conveys solids present in the slurry toward a discharge outlet of the filter device to form the fibrous solids stream.
5. The process of claim 1 , wherein the fibrous solid stream is washed and dewatered to produce additional filtrate.
6. The process of claim 1 , wherein the filtrate is heated before separating the filtrate into a high protein solids stream and a solubles stream.
7. The process of claim 1 , wherein the filtrate is evaporated before separating the filtrate into a high protein solids stream and a solubles stream.
8. The process of claim 1 , wherein separating the filtrate into a high protein solids stream and a solubles stream occurs via a two-phase separator.
9. The process of claim 8 , wherein the two-phase separator comprises a centrifuge.
10. The process of claim 1 , wherein drying the high protein solids stream comprises:
dewatering the high protein solids stream via one or more centrifuges to produce a dewatered, high protein solids stream; and
drying the dewatered, high protein solids stream via one or more dryers to produce the protein meal product.
11. The process of claim 1 , wherein separating the oil product from the condensed soluble stream produces a deoiled, condensed soluble stream, and further comprising:
evaporating deoiled, condensed soluble stream to form syrup; and
combining syrup with fibrous solid stream to produce the fiber product.
12. The process of claim 1 , wherein the flexible screen comprises a flexible, filtering sleeve, and wherein the slurry flows into the flexible, filtering sleeve so that filtrate flows through openings in the flexible, filtering sleeve and separates from the fibrous solid stream.
13. The process of claim 12 , wherein the openings in the flexible, filtering sleeve have an opening size of 250 micrometers or less.
14. The process of claim 13 , wherein the openings in the flexible, filtering sleeve have an opening size of 50 micrometers or less.
15. The process of claim 12 , wherein the flexible, filtering sleeve comprises polymer fabric.
16. The process of claim 15 , wherein the polymer fabric comprises woven, polymer fabric.
17. The process of claim 12 , wherein the filter device is configured to permit the flexible, filtering sleeve to expand and contract along a longitudinal axis of the flexible, filtering sleeve.
18. The process of claim 17 , further comprising a rotor positioned inside the flexible, filtering sleeve, wherein the rotor rotates in a manner that pulses slurry radially outward against the flexible, filtering sleeve.
19. The process of claim 17 , further comprising a rotor positioned inside the flexible, filtering sleeve, wherein the flexible, filtering sleeve vibrates when the rotor rotates at a speed that induces pulsed waves in the slurry.
20. The process of claim 17 , further comprising a rotor positioned inside the flexible, filtering sleeve, wherein the rotor comprises paddles that direct fibrous solids to discharge from the flexible, filtering sleeve.