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Title: Strengths, challenges, and opportunities for hydrothermal pretreatment in lignocellulosic biorefineries

Journal Article · · Biofuels, Bioproducts & Biorefining
DOI:https://doi.org/10.1002/bbb.1825· OSTI ID:1405277
ORCiD logo [1];  [2];  [3]
  1. Washington State Univ., Richland, WA (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Univ. of California, Riverside, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Pretreatment prior to or during biological conversion is required to achieve high sugar yields essential to economic production of fuels and chemicals from low cost, abundant lignocellulosic biomass. Aqueous thermochemical pretreatments achieve this performance objective from pretreatment coupled with subsequent enzymatic hydrolysis, but chemical pretreatment can also suffer from additional costs for exotic materials of construction, the need to recover or neutralize the chemicals, introduction of compounds that inhibit downstream operations, and waste disposal, as well as for the chemicals themselves. The simplicity of hydrothermal pretreatment with just hot water offers the potential to greatly improve the cost of the entire conversion process if sugar degradation during pretreatment, production of un-fermentable oligomers, and the amount of expensive enzymes needed to obtain satisfactory yields from hydrothermally pretreated solids can be reduced. Biorefinery economics would also benefit if value could be generated from lignin and other components that are currently fated to be burned for power. However, achieving these goals will no doubt require development of advanced hydrothermal pretreatment configurations. For example, passing water through a stationary bed of lignocellulosic biomass in a flowthrough configuration achieves very high yields of hemicellulose sugars, removes more than 75% of the lignin for potential valorization, and improves sugar release from the pretreated solids with lower enzyme loadings. Unfortunately, the large quantities of water needed to achieve this performance result in very dilute sugars, high energy costs for pretreatment and product recover, and large amounts of oligomers. Furthermore, improving our understanding of hydrothermal pretreatment fundamentals is needed to gain insights into R&D opportunities to improve performance, and help identify novel configurations that lower capital and operating costs and achieve higher yields.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office (BETO)
Grant/Contract Number:
AC36-08GO28308; EE0006112; PS02-06ER64304
OSTI ID:
1405277
Alternate ID(s):
OSTI ID: 1399060
Report Number(s):
NREL/JA-5100-70374
Journal Information:
Biofuels, Bioproducts & Biorefining, Vol. 12, Issue 1; ISSN 1932-104X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 86 works
Citation information provided by
Web of Science

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Cited By (9)

Effects of Hydrothermal Pretreatment on the Structural Characteristics of Organosolv Lignin from Triarrhena lutarioriparia journal October 2018
Carbohydrate stabilization extends the kinetic limits of chemical polysaccharide depolymerization journal September 2018
Enhancing Lignocellulosic Biomass Hydrolysis by Hydrothermal Pretreatment, Extraction of Surface Lignin, Wet Milling and Production of Cellulolytic Enzymes journal February 2019
Mild hydrothermal pretreatment of sugarcane bagasse enhances the production of holocellulases by Aspergillus niger
  • de Oliveira Gorgulho Silva, Caio; de Castro Moreira dos Santos Júnior, Agenor; Santana, Renata Henrique
  • Journal of Industrial Microbiology & Biotechnology, Vol. 46, Issue 11 https://doi.org/10.1007/s10295-019-02207-0
journal June 2019
A roadmap for renewable C2–C3 glycols production: a process engineering approach journal January 2019
Techno‐economic analysis of jet‐fuel production from biorefinery waste lignin journal December 2018
Discovery of potential pathways for biological conversion of poplar wood into lipids by co-fermentation of Rhodococci strains journal March 2019
Lignin from hydrothermally pretreated grass biomass retards enzymatic cellulose degradation by acting as a physical barrier rather than by inducing nonproductive adsorption of enzymes journal April 2018
Enzyme biotechnology in degradation and modification of plant cell wall polymers journal August 2018

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