skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Revealing the Molecular Structural Transformation of Hardwood and Softwood in Dilute Acid Flowthrough Pretreatment

Journal Article · · ACS Sustainable Chemistry & Engineering

To better understand the intrinsic recalcitrance of lignocellulosic biomass, the main hurdle to its efficient deconstruction, the effects of dilute acid flowthrough pretreatment on the dissolution chemistry of hemicellulose, cellulose, and lignin for both hardwood (e.g. poplar wood) and softwood (e.g. lodgepole pine wood) were investigated at temperatures of 200 °C to 270 °C and a flow rate of 25 mL/minute with 0.05% (w/w) H2SO4. Results suggested that the softwood cellulose was more readily to be degraded into monomeric sugars than that of hardwood under same pretreatment conditions. However, while the hardwood lignin was completely removed into hydrolysate, ~30% of the softwood lignin remained as solid residues under identical conditions, which was plausibly caused by vigorous C5-active recondensation reactions (C-C5). Unique molecular structural features that pronounced the specific recalcitrance of hardwood and softwood to dilute acid pretreatment were identified for the first time in this study, providing important insights to establish the effective biomass pretreatment.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1340882
Report Number(s):
PNNL-SA-120912; 47760; KP1704020
Journal Information:
ACS Sustainable Chemistry & Engineering, Vol. 4, Issue 12; ISSN 2168-0485
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English

References (46)

Fast and efficient alkaline peroxide treatment to enhance the enzymatic digestibility of steam-exploded softwood substrates journal January 2002
Carbon-13 Nuclear Magnetic Resonance Spectrometry book January 1992
Characterization and analysis of the molecular weight of lignin for biorefining studies journal June 2014
Comparative Evaluation of Three Lignin Isolation Protocols for Various Wood Species journal December 2006
Organosolv Ethanol Lignin from Hybrid Poplar as a Radical Scavenger:  Relationship between Lignin Structure, Extraction Conditions, and Antioxidant Activity journal August 2006
Simulated autohydrolysis of aspen milled wood lignin in the presence of aromatic additives: Structural modifications journal October 1980
Structure and Reactivity of Spruce Mechanical Pulp Lignins. IV: 13 C-NMR Spectral Studies of Isolated Lignins journal November 1994
Substituent Effects on C-13 Chemical Shifts of Aromatic Carbons in Biphenyl Type Lignin Model Compounds journal December 1989
Lignin and Lignans book August 2010
Evaluation of a combined brown rot decay–chemical delignification process as a pretreatment for bioethanol production from Pinus radiata wood chips journal May 2010
Plant Biomass Characterization: Application of Solution- and Solid-State NMR Spectroscopy book April 2013
Structural Transformation of Isolated Poplar and Switchgrass Lignins during Dilute Acid Treatment journal August 2015
Pretreatment of Lodgepole Pine Killed by Mountain Pine Beetle Using the Ethanol Organosolv Process:  Fractionation and Process Optimization journal April 2007
Ethanol organosolv pretreatment of softwood (Picea abies) and sugarcane bagasse for biofuel and biorefinery applications journal May 2015
Characterization of the degree of polymerization of xylooligomers produced by flowthrough hydrolysis of pure xylan and corn stover with water journal September 2008
Noble-metal catalyzed hydrodeoxygenation of biomass-derived lignin to aromatic hydrocarbons journal January 2014
Dilute Acid Hydrolysis of Softwoods(Scientific Note) journal January 1999
Isolation and characterization of lignins from Eucalyptus grandis Hill ex Maiden and Eucalyptus globulus Labill. by enzymatic mild acidolysis (EMAL) journal January 2008
High-alkali low-temperature polysulfide pulping (HALT) of Scots pine journal October 2015
Deposition of Lignin Droplets Produced During Dilute Acid Pretreatment of Maize Stems Retards Enzymatic Hydrolysis of Cellulose journal December 2007
Two-Stage Dilute-Acid Pretreatment of Softwoods journal January 2000
The fate of lignin during hydrothermal pretreatment journal January 2013
Hydrothermolysis of Birch Wood as Pretreatment for Enzymatic Saccharification journal January 1988
Review of current and future softwood kraft lignin process chemistry journal September 2004
Optimization of chip size and moisture content to obtain high, combined sugar recovery after sulfur dioxide-catalyzed steam pretreatment of softwood and enzymatic hydrolysis of the cellulosic component journal July 2015
Physiochemical Characterization of Lignocellulosic Biomass Dissolution by Flowthrough Pretreatment journal December 2015
Recalcitrance and structural analysis by water-only flowthrough pretreatment of 13C enriched corn stover stem journal December 2015
Enhancement of total sugar and lignin yields through dissolution of poplar wood by hot water and dilute acid flowthrough pretreatment journal January 2014
Effect of xylan and lignin removal by batch and flowthrough pretreatment on the enzymatic digestibility of corn stover cellulose journal January 2004
The influence of lignin on steam pretreatment and mechanical pulping of poplar to achieve high sugar recovery and ease of enzymatic hydrolysis journal January 2016
A review of the production of ethanol from softwood journal July 2002
Analysis, pretreatment and enzymatic saccharification of different fractions of Scots pine journal January 2014
Characterization of lignin derived from water-only and dilute acid flowthrough pretreatment of poplar wood at elevated temperatures journal December 2015
Pseudo-lignin formation and its impact on enzymatic hydrolysis journal August 2012
Whole plant cell wall characterization using solution-state 2D NMR journal August 2012
Summary of findings from the Biomass Refining Consortium for Applied Fundamentals and Innovation (CAFI): corn stover pretreatment journal June 2009
Chemical aspects of kraft pulping journal January 1980
Effects of SPORL and Dilute Acid Pretreatment on Substrate Morphology, Cell Physical and Chemical Wall Structures, and Subsequent Enzymatic Hydrolysis of Lodgepole Pine journal September 2012
Fractionation of Lignocellulosics by Steam-Aqueous Pretreatments [and Discussion]
  • Overend, R. P.; Chornet, E.; Gascoigne, J. A.
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 321, Issue 1561 https://doi.org/10.1098/rsta.1987.0029
journal April 1987
Pseudo-lignin and pretreatment chemistry journal January 2011
Visualizing lignin coalescence and migration through maize cell walls following thermochemical pretreatment journal December 2008
Influence of pretreatment condition on the fermentable sugar production and enzymatic hydrolysis of dilute acid-pretreated mixed softwood journal July 2013
Effect of steam explosion pretreatment with ultra-high temperature and pressure on effective utilization of softwood biomass journal January 2012
Lignin depolymerization/repolymerization and its critical role for delignification of aspen wood by steam explosion journal November 2007
On energy consumption for size-reduction and yields from subsequent enzymatic saccharification of pretreated lodgepole pine☆ journal April 2010
Chemistry of delignification journal December 1985

Cited By (5)

An effective hybrid strategy for converting rice straw to furoic acid by tandem catalysis via Sn-sepiolite combined with recombinant E. coli whole cells harboring horse liver alcohol dehydrogenase journal January 2019
Strengths, challenges, and opportunities for hydrothermal pretreatment in lignocellulosic biorefineries journal October 2017
Efficient Mild Organosolv Lignin Extraction in a Flow-Through Setup Yielding Lignin with High β-O-4 Content journal November 2019
Development of high bio-content polypropylene composites with different industrial lignins journal September 2018
Structural features influential to enzymatic hydrolysis of cellulose-solvent-based pretreated pinewood and elmwood for ethanol production journal November 2017