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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Liquid-liquid extraction: A promising alternative for inhibitors removing of pentoses fermentation

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Roque, Laerti Reis [1] ; Morgado, Grazielle Patricia [1] ; Nascimento, Viviane Marcos [1] ; Ienczak, Jaciane Lutz [1, 2] ; Rabelo, Sarita Candida [1]
Total Authors: 5
[1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Bioethanol Sci & Technol Lab CTBE, Campinas, SP - Brazil
[2] Fed Univ Santa Catarina UFSC, Dept Chem Engn & Food Engn, Florianopolis, SC - Brazil
Total Affiliations: 2
Document type: Journal article
Source: FUEL; v. 242, p. 775-787, APR 15 2019.
Web of Science Citations: 3

Dilute sulfuric acid pretreatment is effective at producing a xylose-rich hydrolysate from lignocellulosic biomasses, however inhibitory compounds, released during the processes, can affect the metabolism of fermenting microorganisms, thus reducing the biomass formation, yields and productivity. In this scenario, two approaches for hemicellulosic hydrolysate detoxification were evaluated: liquid-liquid extraction (process 1) and evaporation followed by liquid-liquid extraction (process 2), using 1-butanol, isobutyl acetate and MIBK as extractants. The hydrolysates (detoxified and non-detoxified) fermentations were evaluated by S. stipitis and S. passalidarum. Although process 1 has provided good removal efficiencies, acetic acid concentration in detoxified hydrolysate was still relatively high, while process 2 resulted in 90% of global acetic acid removal. S. passalidarum detoxified hydrolysates fermentation showed higher ethanol yields and productivities than S. stipitis. An inhibitory effect of 1-butanol has been achieved for both yeasts, resulting in low sugar consumption and consequently low ethanoltiters. Process 2 with MIBK led to 69.0% of phenolics; 85.4% of acetic acid and 100.0% of HMF and furfural extractions, with ethanol yield and productivity of 75.6% and 0.41 g/g, respectively. This process comes up as a promising method once it provides toxic-compounds removal without carbohydrates losses and allows an extractant-recycling integrated process. (AU)

FAPESP's process: 15/20630-4 - Biorefinery development integrated to a bioethanol sugar cane plant with zero CO2 emission: routes to convert renewable resources to bio-products and bio-electricity
Grantee:Rubens Maciel Filho
Support type: Research Projects - Thematic Grants