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Fractionation of Lignocellulosic Biomass using the OrganoCat Process
Published on: June 5, 2021
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Toward high solids loading process for lignocellulosic biofuel production at a low cost
Mingjie Jin1,2, Cory Sarks2, Bryan D Bals2
1School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Biotechnology and Bioengineering
|November 27, 2016
Summary
High solids loadings in lignocellulosic biofuel production are key for cost reduction. Removing ethanol during simultaneous saccharification and co-fermentation (SSCF) improves sugar conversion at high solids concentrations.
Area of Science:
- Biotechnology
- Bioenergy
- Biochemical Engineering
Background:
- High solids loadings (>18 wt%) are crucial for cost-effective lignocellulosic biofuel production.
- Decreased sugar conversion and ethanol yield at high solids loadings limit current processes.
- The specific limiting factors at high solids loadings remain unclear.
Purpose of the Study:
- To investigate the impact of solids loading on simultaneous saccharification and co-fermentation (SSCF) of pretreated corn stover.
- To identify the factors limiting sugar conversion and ethanol yield at high solids loadings.
- To evaluate the efficacy of in situ ethanol removal for improving SSCF performance.
Main Methods:
- Utilized ammonia fiber expansion (AFEX) pretreated corn stover.
- Employed a xylose-fermenting Saccharomyces cerevisiae strain (424A(LNH-ST)).
- Performed SSCF under varying solids loadings and investigated aerobic conditions for in situ ethanol removal.
Main Results:
- Observed decreased sugar conversion and ethanol yield with increasing solids loading.
- Identified end-product inhibition (ethanol) and increased degradation products as key limitations.
- Achieved 93% monomeric sugar conversion at 24.9 wt% solids loading by performing SSCF aerobically for in situ ethanol removal.
Conclusions:
- In situ ethanol removal during aerobic SSCF overcomes limitations at high solids loadings.
- This strategy significantly enhances sugar conversion and is crucial for economic cellulosic ethanol production.
- Techno-economic analysis indicates that cost-effective ethanol removal can improve process economics.
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