Abstract
Levulinic acid (LA) is currently one of the most promising chemicals derived from biomass. However, its large-scale production is hampered by the challenges in biomass hydrolysis and the poor selectivity due to the formation of humins (HUs). This study addresses these challenges using the biorefinery concept of biomass fractionation. A three-step process (pretreatment, delignification, and acid-catalyzed conversion) was optimized to produce LA from SCB considering the yield (YLA), efficiency (ELA), and concentration of LA (CLA) as functions of temperature, reaction time, acid concentration, and solids loading. By means of a multi-response optimization, values of YLA (20.9 ± 1.25 g/100gISF-D), ELA (37.5 ± 2.24 mol%), and CLA (25.1 ± 1.50 g/L) were obtained at 180 °C, 75 min, 7.0% w/v H2SO4, and 12.0% w/v of solids loading. Six scenarios for production of LA were analyzed in terms of yields of LA, HUs, lignin, and other sugar-derived products considering one-, two-, or three-step processes. The economic analysis indicated that the three-step scenario delivers better economic figures given that other valuable biomass fractions (hemicellulosic sugars and lignin) are better used and contribute to the overall economic performance of the process. The results also demonstrate the burden of HUs in the economics of the process because it was shown that the largest production of LA is also linked to the largest formation of HUs, which does not necessarily yield the best economic results. These findings indicate the importance of added value by-products for the profitable production of LA in biorefineries.
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Funding
This work was supported by São Paulo Research Foundation—FAPESP (grant numbers 2015/17592-3, 2015/20630-4, 2016/10450-1, and 2017/23335-9) and National Council for Scientific and Technological Development—CNPq (Public investment by Universal Call MCTIC/CNPq no. 28/2018 and grant number 408149/2018-3).
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Lopes, E.S., Leal Silva, J.F., Rivera, E.C. et al. Challenges to Levulinic Acid and Humins Valuation in the Sugarcane Bagasse Biorefinery Concept. Bioenerg. Res. 13, 757–774 (2020). https://doi.org/10.1007/s12155-020-10124-9
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DOI: https://doi.org/10.1007/s12155-020-10124-9