Analyzing Changes in Lignin Chemistry Due to Biofuel Production Processes
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1 Analyzing Changes in Lignin Chemistry Due to Biofuel Production Processes S. Carter Fox Weyerhaeuser Northwest Wood-Based Biofuels + Co-Products Conference I Seattle, WA I April 30, 2014
2 NARA Supply Chain 2 Image credit: NARA
3 Source of Lignin in a Biorefinery Image from: Alonso, D. M.; Wettstein, S. G.; Dumesic, J. A. Chem. Soc. Rev. 2012, 41,
4 The Need for Co-Products Relative IPK Production Cost Speculative need to be developed Credit: Gevan Marrs, NARA
5 Few Commercial Uses for Lignin Annual lignin production: 40 to 50 million metric tons? Annual commercial lignin consumption: 1.5 million metric tons What is the problem? Why isn t lignin more widely used? Are the chances for success in lignin utilization better today? 5
6 Lignin Complexity Lignin is a complex molecule to begin with. CH 3 H 3 C H H H CH 3 H H CH 3 H H H 3 C H H H 3 C H H H H H CH 3 H CH 3 H CH 3 CH 3 H H CH 3 H H H H H H Ref: Zakzeski, J., et al., Chem. Rev. 2010, 110, H 3 C H H CH 3 H CH 3 CH 3 H H CH 3 H 6
7 Lignin Isolation Affects its Structure and Purity Commercial Kraft pulping Sulfite pulping Non-commercial rganosolve pulping Milled wood Ionic liquid pretreatment Mild acid hydrolysis 7 Photo credit: JBEI
8 Drivers for Success Near Term Cleaner commercial lignins Characterization methods are more powerful New market opportunities 8 Long Term Better methods to break specific lignin bonds Advances in biomass fractionation Ability to manipulate lignin biosynthesis
9 Many Possibilities from Lignin Concrete Dispersant Fine Chemicals Fuels Phenolic Resins Lignin Carbon Products Thermoplastics Energy Storage Adsorbents 9 Rubber Reinforcement
10 NARA Supply Chain 10 Image credit: NARA
11 NARA Co-Product Streams Wood Chips or Forest Residuals MBS Process Wx Process Spent Sulfite Liquor Treated Wood Treated Wood Enzyme Hydrolysis & Fermentation Enzyme Hydrolysis & Fermentation Residual Solids Residual Solids 11 Soluble Sugars to Fermentation
12 Mild Bisulfite Pretreatment (MBS) Process development by Johnway Gao and Dwight Anderson at Catchlight Energy and J.Y. Zhu at the Forest Products Laboratory 12 Refs: Zhang, C., et al. BioEnergy Research. 2012, 5, Gao, J., et al. Biotechnology for Biofuels 2013, 6, 10.
13 Wet xidation Pretreatment Lignin Hemicellulose Cellulose Flash Tank 2 + steam Elevated temperature & pressure Contains all wood components Process development by Dr. Brigitte Ahring at Washington State University s Bioproducts, Sciences & Engineering Laboratory Ref: Rana, D., et al. Bioresour. Technol. 2012, 121,
14 Composition of Fermentation Residual Solids (FRS) Sample Total Klason Lignin Total Polysaccharide Ash Sulfur Feedstock 34.9% 54.4% 0.2% 0.0% MBS FRS as rec d MBS FRS washed Wet x FRS as rec d Wet x FRS washed 70.4% 18.9% 8.9% 2.4% 69.4% 23.9% 4.1% 1.8% 53.0% 43.9% 2.0% 0.1% 53.4% 47.3% 0.5% 0.0% % oven dry 14
15 How to Determine FRS Lignin Chemistry? Saccharification and fermentation residual solids are insoluble in all attempted solvents. Need to extract high purity, unmodified lignin from SRS and FRS samples. Can we simply extract lignin using dioxane/water mixture, similar to milled wood lignin? Not really. Sample Yield MBS SRS 2.8% Wet x SRS 8.3% 15
16 Ball Milling Increases Extracted Lignin Yield 25% Effect of Ball Milling on Lignin Isolation from Wet x SRS Isolated Yield 20% 15% 10% 5% 0% Ball Milling Time (h) 16
17 Enzymatic Mild Acidolysis Lignin (EMAL) Procedure developed by the Argyropoulos research group at NC State. (Ref: Guerra, A., et al. J. Agric. Food. Chem. 2006, 54, ) Ball Milling 21 days Enzymatic Hydrolysis 48 hours Solvent Extraction 2 hours 17
18 Lignin Isolation Yields Sample Enzymatic Hydrolysis Yield Lignin Extraction Yield Extracted Lignin Purity Forest Residuals 42.8% 52.4% 81.0% Mild Bisulfite FRS 64.7% 52.5% 95.4% Wet xidation FRS 86.4% 44.9% 94.2% 18
19 Lignosulfonate Isolation Procedure rganic extraction Back extraction rganic Phase LS/amine complex rganic Phase Dodecylamine Spent Sulfite Liquor C 12 H 25 NH 3 in octanol Aqueous Phase Residual sugars, salts aqueous NaH Aqueous Phase Na + LS Discard Retain and dry 19 Ref: Ringena,., et al. Holzforschung 2005, 59,
20 Elemental Analysis of Isolated Lignins Sample Sulfur Carbon Hydrogen Nitrogen xygen* Forest Residual Lignin Wet xidation Lignin Mild Bisulfite Lignin MBS Lignosulfonic acid * xygen determined by difference All values % oven dry 20
21 31 P NMR Analysis of EMALs CH 3 CH 3 Lignin H + Cl P Lignin P CH 3 CH 3 CH 3 + H Cl CH 3 CH 3 CH 3 internal standard aliphatic H phenolic H guaiacyl TMDP hydrolysis product C-5 substituted CH ppm Quant. 31 P NMR spectrum of forest harvest residual EMAL
22 Hydroxyl Group Comparison Sample Aliphatic H Aromatic H C-5 Substituted H CH Forest Residuals Lignin Wet xidation Lignin Mild Bisulfite Lignin MBS Lignosulfonic acid
23 Molecular Weight Analysis Sample Mn Mw PDI Forest Residuals Lignin 26.8 ± Wet xidation Lignin 34.1 ± Mild Bisulfite Lignin MBS Lignosulfonic acid
24 Summary Developing value-added products from lignin-rich process residuals will be critical to large scale biorefinery commercial success. Different pretreatment technologies produce residuals with different properties. The residues from Mild Bisulfite and Wet xidation pretreatments contain a lot more than just lignin. Processes to upgrade lignin must be robust enough to handle significant impurity content and variability in the feedstock. 24
25 Summary High purity lignin was isolated from the Mild Bisulfite and Wet xidation residuals and characterized with respect to elemental content, hydroxyl group content, and molecular weight 25
26 Acknowledgements Colleagues Dave Fish and Ian Dallmeyer NARA Summer undergraduate intern Steve Cline NARA is primarily supported by an Agriculture and Food Research Initiative Competitive Grant no from the USDA National Institute of Food and Agriculture. 26
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