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  • Title: Hybrid process for the conversion of lignocellulosic materials.
    Author: Lee KC, Bulls M, Holmes J, Barrier JW.
    Journal: Appl Biochem Biotechnol; 1997 Apr; 66(1):1-23. PubMed ID: 9204515.
    Abstract:
    Because of the recalcitrant nature of lignocellulosic materials, it is important to pretreat the biomass in order to obtain a suitable material for the bioconversion. In this study, two different types of pretreatments were performed. The first experiment used a 2-gal Parr reactor operated at 140, 150, 160, and 170 degrees C with sulfuric acid concentrations varying from 0.5 to 2%. A second pretreatment was performed with a two-stage low-temperature process. The first-stage pretreatment was performed at 100 or 120 degrees C with sulfuric acid concentrations of 0.5, 2, and 5% followed by a second-stage pretreatment at 120 degrees C with 2% acid concentration. The best residues for enzymatic hydrolysis and simultaneous saccharification and fermentations (SSF) came from the higher temperature pretreatment with the Parr reactor. However, a large portion of the xylose fraction was degraded to furfural and glucose was degraded to HMF. On the contrary, the two-stage low temperature pretreatment resulted in a very low percentage of xylose degradation, and no glucose degradation. The residues from this two-stage pretreatment performed satisfactorily toward the production of ethanol by SSFs. This study discusses the results obtained from these experiments.
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