Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium

Sergiy Popov, Isaiah Ruhl, Nirmal Uppugundla, Leonardo Da Costa Sousa, Venkatesh Balan, Patrick G. Hatcher, Sandeep Kumar

    Research output: Contribution to journalArticle

    • 1 Citations

    Abstract

    Bioethanol can be produced from lignocellulosic feedstock using a biochemical route involving enzymatic hydrolysis followed by microbial fermentation. During these processes, about 30 to 40% of the biomass is left behind as wet unhydrolyzed solids (UHS), depending on the type of biomass, enzyme loading, and duration of enzymatic hydrolysis. The UHS is mostly composed of lignin, bound enzymes, undigested recalcitrant carbohydrates and ash. The efficient conversion of UHS into bio-oil will increase the overall conversion efficiency of biomass to liquid fuels (bioethanol and bio-oil) and has the potential to reduce the cost of biofuel production from lignocellulosic biomass. In this paper we report the results of bio-oils production from UHS via hydrothermal liquefaction (HTL) under varying temperatures (280-350°C) and subcritical water conditions. The effects of K2CO3 and supported bimetallic CoMo/Al2O3 catalysts during HTL process were investigated. The UHS used in this study was produced after enzymatic hydrolysis of Ammonia Fiber Expansion (AFEX) pretreated corn stover (ACS). Bio-oil yields at different HTL temperatures were quantified and characterized using 1H-NMR, 13C-NMR, GC-MS, and elemental analysis. The yield of bio-oil was higher in the presence of 5 wt% of K2CO3 during HTL in comparison with CoMo/Al2O3 catalyst. The highest degree of liquefaction (DL) and bio-oil yield were respectively 43.4% and 30.1 wt% at 350°C in the presence of K2CO3 while the highest ECR was 57.1% at 320°C in the presence of K2CO3. The study is one of the first of its kind where unhydrolyzed solids, left behind after bioethanol production, were used for making bio-oils with traditional and reduced bimetallic CoMo/Al2O3 catalysts in an aqueous medium. The results of the study can contribute to the development of the lignocellulosic biomass-based biorefinery concept.

    Original languageEnglish (US)
    Pages (from-to)431-446
    Number of pages16
    JournalBiofuels
    Volume5
    Issue number4
    DOIs
    StatePublished - Jul 4 2014

    Profile

    oil
    liquefaction
    Liquefaction
    biomass
    Biomass
    hydrolysis
    catalyst
    Bioethanol
    Enzymatic hydrolysis
    Catalysts
    nuclear magnetic resonance
    enzyme
    temperature
    Enzymes
    Nuclear magnetic resonance
    Temperature
    biofuel
    oil production
    lignin
    fermentation

    Keywords

    • bio-oils
    • biochar
    • hydrothermal liquefaction
    • phenolic compounds
    • unhydrolyzed solids

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Waste Management and Disposal

    Cite this

    Popov, S., Ruhl, I., Uppugundla, N., Da Costa Sousa, L., Balan, V., Hatcher, P. G., & Kumar, S. (2014). Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium. Biofuels, 5(4), 431-446. DOI: 10.1080/17597269.2014.987099

    Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium. / Popov, Sergiy; Ruhl, Isaiah; Uppugundla, Nirmal; Da Costa Sousa, Leonardo; Balan, Venkatesh; Hatcher, Patrick G.; Kumar, Sandeep.

    In: Biofuels, Vol. 5, No. 4, 04.07.2014, p. 431-446.

    Research output: Contribution to journalArticle

    Popov, S, Ruhl, I, Uppugundla, N, Da Costa Sousa, L, Balan, V, Hatcher, PG & Kumar, S 2014, 'Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium' Biofuels, vol 5, no. 4, pp. 431-446. DOI: 10.1080/17597269.2014.987099
    Popov S, Ruhl I, Uppugundla N, Da Costa Sousa L, Balan V, Hatcher PG et al. Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium. Biofuels. 2014 Jul 4;5(4):431-446. Available from, DOI: 10.1080/17597269.2014.987099

    Popov, Sergiy; Ruhl, Isaiah; Uppugundla, Nirmal; Da Costa Sousa, Leonardo; Balan, Venkatesh; Hatcher, Patrick G.; Kumar, Sandeep / Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium.

    In: Biofuels, Vol. 5, No. 4, 04.07.2014, p. 431-446.

    Research output: Contribution to journalArticle

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