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Dual Pretreatment Strategy for Enhanced Biomass Hydrolysis

This work explores a dual pretreatment strategy involving Dilute Acid Treatment (DAT) and N-methyl morpholine N-oxide (NMMO) to enhance biomass hydrolysis. The study compares the effectiveness of this strategy on corn stover and sugarcane bagasse, reaching higher conversion rates and shorter processing times. The use of NMMO as a cellulose treatment solvent offers the potential for high conversion rates and the ability to recycle over 99% of the solvent.

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Dual Pretreatment Strategy for Enhanced Biomass Hydrolysis

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  1. Dual Pretreatment Strategy for Enhanced Biomass Hydrolysis G. Brodeur, S. Ramakrishnanand J.C. Telotte Department of Chemical and Biomedical Engineering FAMU – FSU College of Engineering

  2. DA Treatment Even at the highest conversion there is still >15% of the material that is left inaccessible Dilute Acid Treatment (Pilot Plant) National Renewable Energy Laboratory (NREL) Corn Stover: 190ᵒC; 1 min; 50 mg H2SO4/g dry biomass Florida Center for Renewable Chemicals and Fuels (UF) Sugarcane Bagasse: 190ᵒC; 5 min; 0.5% w/w H3PO4 Lignin Pretreatment Cellulose Hemicellulose DA Treatment

  3. Amine Oxide Dissolution (NMMO) Cell OH H Cell N-methyl morpholine N-oxide (NMMO) monohydrate Treatment Conditions Moderate temperatures (100ᵒC) Short dissolution times (<3 hours) High solids loadings (up to 20% w/w) Petrovan et al., J. Appl. Polym. Sci.2001 This work reports data for 3-5% (w/w) Regeneration with anti-solvent (water) Benefits: Highly effective cellulose treatment Reported ability to recycle over 99% of solvent Biodegradable Raw feedstock will not completely dissolve - +

  4. Pretreatment Comparison ~98% Conversion ~91% Conversion Corn Stover Sugarcane Bagasse --Reaches maximum conversion of DATCS 48 hours faster!! --Nearly complete conversion after 72 hours

  5. Increased Loadings & NMMO Recycle Corn Stover Sugarcane Bagasse

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