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Bioethanol production from lignocellulosic biomass typically does not include which of the following stages?
EXPLANATION
Lignocellulosic Bioethanol Production
- Stages of Lignocellulosic Bioethanol Production:
- The biochemical platform for ethanol synthesis from lignocellulose follows four sequential operations:
- Pretreatment: Physical/chemical breakdown of crystalline cellulose and removal of hemicellulose and lignin sheath.
- Enzymatic Hydrolysis (Saccharification): Cellulase enzymes depolymerize cellulose into fermentable hexose sugars (glucose).
- Fermentation: Microbial conversion of hexoses/pentoses into ethanol using yeast (Saccharomyces cerevisiae).
- Distillation & Dehydration: Rectification and molecular sieve adsorption to concentrate hydrous ethanol to anhydrous grade ($\gt 99.5\%$).
- Pyrolysis: A thermochemical process converting dry biomass into bio-oil, syngas, and biochar, which is not part of the biochemical bioethanol route.
- Conclusion: Pyrolysis (Option 4).
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