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Hybrid process for the conversion of lignocellulosic materials

K C Lee¹, M Bulls, J Holmes

¹Tennessee Valley Authority ERC, Department of Biotechnology, AL 35662, USA.

Applied Biochemistry and Biotechnology

|April 1, 1997

Summary

Biomass pretreatment is crucial for bioconversion. A two-stage low-temperature method effectively preserved sugars, unlike higher temperatures that caused degradation, making it suitable for ethanol production via simultaneous saccharification and fermentation (SSF).

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Area of Science:

Biomass Pretreatment
Bioconversion Technologies
Renewable Energy

Background:

Lignocellulosic materials are recalcitrant, necessitating pretreatment for efficient bioconversion.
Effective pretreatment is key to optimizing biomass for processes like simultaneous saccharification and fermentation (SSF).

Purpose of the Study:

To compare two distinct pretreatment methods for lignocellulosic biomass.
To evaluate the impact of pretreatment conditions on sugar degradation and subsequent ethanol production.

Main Methods:

High-temperature pretreatment using a Parr reactor (140-170°C) with varying sulfuric acid concentrations (0.5-2%).
Two-stage low-temperature pretreatment (100-120°C) with specific sulfuric acid concentrations, followed by a second stage at 120°C with 2% acid.

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Main Results:

Higher temperature pretreatment yielded better residues for SSF but caused significant xylose and glucose degradation (furfural and HMF formation).
Two-stage low-temperature pretreatment minimized xylose degradation and prevented glucose degradation.
Residues from the two-stage pretreatment demonstrated satisfactory performance in ethanol production via SSF.

Conclusions:

The two-stage low-temperature pretreatment is a more effective method for preserving sugars in lignocellulosic biomass compared to high-temperature methods.
This optimized pretreatment strategy supports efficient ethanol production through simultaneous saccharification and fermentation (SSF).