Upgrading process streams
Biomass (e.g., plant biomass, animal biomass, and municipal waste biomass) is processed to produce useful intermediates and products, such as energy, fuels, foods or materials. Systems, methods and equipment are described for upgrading process streams using electrodialysis or electrodialysis reversal.
1. A method comprising:
pretreating a cellulosic or lignocellulosic material with ionizing radiation;
saccharifying the radiated cellulosic or lignocellulosic material to obtain saccharified biomass liquids; and
removing salts, partially ionized acids or fully ionized acids, from the saccharified biomass liquids utilizing a first electrodialysis system and converting the removed salt to its neutralized form utilizing a second electrodialysis system, wherein the second electrodialysis system comprises a bipolar membrane electrodialysis system.
2. The method of claim 1 , wherein the first electrodialysis system utilizes electrodialysis or electrodialysis reversal.
3. The method of claim 1 , wherein the ionizing radiation is in the form of accelerated electrons.
4. The method of claim 1 , wherein the cellulosic or lignocellulosic biomass has been saccharified utilizing one or more enzymes.
5. The method of claim 1 , wherein the cellulosic or lignocellulosic biomass has been saccharified utilizing one or more acids.
6. The method of claim 5 , wherein the acid is sulfuric acid.
7. The method of claim 1 , wherein an ionic strength of the saccharified biomass liquids prior to electrodialysis is between about 500 and about 50,000 μS/cm, and wherein an ionic strength of the saccharified biomass liquids after electrodialysis in the first electrodialysis system is between 1 and 100 μS/cm.
8. The method of claim 1 , wherein the salts, partially ionized acids or fully ionized acids removed utilizing the electrodialysis system comprise at least one element selected from the group consisting of P, K, Mg, Na, Ca, S, O, Mn, Al, Zn, Si, Cl and Fe.
9. The method of claim 1 , further comprising purifying the saccharified biomass liquids by a method selected from the group consisting of chromatography, filtration, centrifugation, precipitation, distillation, complexation and combinations thereof.
10. The method of claim 9 , wherein precipitation comprises addition of one or more solvents or non-solvents to precipitate one or more undesired components.
11. The method of claim 10 , wherein the solvent is selected from the group consisting of methanol, ethanol, isopropanol, acetone, ethyl ether and tetrahydrofuran.
12. The method of claim 10 , wherein the solvent is methanol.
13. The method of claim 1 , wherein the saccharified biomass liquids comprise one or more fermentation products.
14. The method of claim 1 , wherein the saccharified biomass liquids comprise liquids that have had a fermentation product distilled therefrom.
15. The method of claim 14 , wherein the fermentation product is an alcohol.
16. The method of claim 15 , wherein the alcohol is ethanol.
17. The method of claim 1 , further comprising decolorizing the saccharified biomass liquids utilizing a decolorizing agent.
18. The method of claim 17 , wherein the decolorizing agent is selected from the group consisting of powdered carbon, granular carbon, extruded carbon, bone char carbon, bead activated carbon, stryenic resins, acrylic resins, magnetic resins, decolorizing clays, bentonite, attapulgite, montmorillonite, hormite and combinations thereof.
19. The method of claim 17 , wherein after decolorizing the color of the solution is less than about 100 color units.
20. The method of claim 1 , wherein utilizing the first electrodialysis system comprises applying a voltage of between about 10 and 150V across ion selective membranes while flowing the saccharified biomass liquids past the membranes.
21. The method of claim 1 , wherein the saccharified biomass liquids comprise one or more saccharides.
22. The method of claim 1 , wherein the saccharified biomass liquids include a sugar selected from the group consisting of xylose, glucose, arabinose, fructose and mixtures thereof.
23. The method of claim 22 , wherein the sugar includes xylose and the purity of the xylose after utilizing the first electrodialysis system is at least about 80 wt. %.
24. The method of claim 23 , wherein the sugar includes arabinose and the purity of the arabinose after utilizing the first electrodialysis system is about 0 to 1 wt. %.