METHODS OF MAKING SPECIALIZED CELLULOSE AND OTHER PRODUCTS FROM BIOMASS
Provided is microcrystalline cellulose (MCC) from cellulosic or lignocellulosic biomass produced efficiently and quickly through cost-effective methods and systems. The MCC is comprised of short fibers due to the process through which the biomass is subjected. In addition to MCC, nanocellulose (CNF), and high quality crystalline nanocellulose (CNC) can be produced, as well as other cellulosic compounds, clean lignin and monomeric C5 and C6 sugars.
1 . A low-energy intensive method for producing cellulose from biomass, the method comprising:
a. pretreating said biomass with fibrillation, an acid, an elevated temperature, and an elevated pressure within an extruder to produce a liquid fraction comprising solubilized hemicellulose and/amorphous cellulose and a solids fraction comprising cellulose and lignin;
b. separating the liquid fraction from the solids fraction;
c. treating the solids fraction with an alkaline solution to solubilize the lignin, thereby producing solubilized lignin; and
d. separating the solubilized lignin from the cellulose.
2 . The method of claim 1 , wherein the cellulose comprises crystalline cellulose and nanocellulose.
3 . The method of claim 1 , wherein the particle size of the cellulose has a particle size between 2 μm and 120 μm.
4 . The method of claim 1 , wherein the cellulose has a mean particle size about 60 μm.
5 . The method of claim 1 , wherein the lignin is solubilized by ionic liquid.
6 . (canceled)
7 . The method of claim 1 wherein by treating the solids fraction with the alkaline solution, pH of the solids fraction is raised to about 7.5, about 8.0, about 8.5, about 9.0, about 9.5, about 10.0, about 10.5, or about 11.
8 . (canceled)
9 . The method of claim 1 wherein the alkaline solution comprises a compound selected from the group consisting of: sodium hydroxide, calcium hydroxide, potassium hydroxide, ammonia, ammonia hydroxide, hydrogen peroxide, and a combination thereof.
10 . (canceled)
11 . The method of claim 1 , wherein the alkaline solution comprises a ionic liquid selected from the group consisting of: ethanol, ammonium, phosphonium and pyrrolidinium-based ionic liquids, and a combination thereof.
12 . The method of claim 1 , wherein the lignin is separated from the cellulose by centrifugation, filtration, membrane filtration, diafiltration, or flocculation.
13 . The method of claim 1 , wherein the lignin is precipitated with acid.
14 . The method of claim 13 , wherein the acid is selected from the group consisting of: sulfuric acid, peroxyacetic acid, hydrochloric acid, phosphoric acid, oxalic acid, lactic acid, formic acid, acetic acid, citric acid, benzoic acid, sulfurous acid, chloroacetic acid, dichloroacetic acid, trichloroacetic acid, and a combination thereof.
15 . The method of claim 1 , further comprising converting the lignin into activated carbon, foams, films or other bioproducts.
16 . The method of claim 1 , further comprising fractionating or hydrolyzing the liquid fraction with enzymes or a biocatalyst.
17 . The method of claim 1 , further comprising hydrolyzing the liquid fraction by enzymes or a biocatalyst.
18 . The method of claim 1 , further comprising purifying or clarifying the liquid fraction.
19 . The method of claim 1 , further comprising converting the liquid fraction into a fuel.
20 . The method of claim 1 , further comprising hydrolyzing the amorphous cellulose in the presence of sulfuric acid.
21 . (canceled)
22 . (canceled)
23 . The method of claim 1 , further comprising decolorizing the cellulose with a decolorizing agent.
24 . The method of claim 23 , wherein the decolorizing agent is H202.
25 . The method of claim 1 , wherein the biomass is selected from the group consisting of:
corn syrup, molasses, silage, agricultural residues, corn stover, bagasse, sorghum, nuts, nut shells, coconut shells, Distillers Dried Solubles (DDS), Distillers Dried Grains (DDG), Condensed Distillers Solubles (CDS), Distillers Wet Grains (DWG), Distillers Dried Grains with Solubles (DDGS), woody materials, sawdust, wood chips, timber slash, mill scrap, municipal waste, waste paper, recycled toilet papers, yard clippings, and energy crops such as poplars, willows, switchgrass, alfalfa, and prairie bluestem, algae, including Chlorophyta, Phaeophyta, and Rhodophyta, non-woody plant matter, cellulosic material, lignocellulosic material, hemicellulosic material, carbohydrates, pectin, starch, inulin, fructans, glucans, corn, sugar cane, grasses, switchgrass, high biomass sorghum, bamboo, corncobs, peels, and pits.
26 - 29 . (canceled)