Co-generation of liquid biofuels from lignocellulose by integrated biochemical and hydrothermal liquefaction process

Bingshuo Li, Tianhua Yang, Rundong Li and Xingping Kai

Energy, 2020, vol. 200, issue C

Abstract: Different thermal stability of three major components is a challenge to efficiently liquefy lignocellulosic biomass into bio-oil because the degradation products from holocellulose can react with lignin, resulting in repolymerization reactions. In this work, a biorefinery approach of co-generation of bioethanol and bio-oil from rice straw that integrated separate hydrolysis and fermentation (SHF) and hydrothermal liquefaction (HTL) processes was proposed. SHF of dilute sulfuric acid pretreated rice straw gave a bioethanol concentration of 8.3 g/L with approximately 68% of theoretical yield. The maximum bio-oil yield 31.36 wt% via HTL of solid fermentation residues using bioethanol wastewater as the solvent was obtained under optimum conditions. Mass balance showed that 9.7 wt% bioethanol and 15.0 wt% bio-oil were produced corresponding to 56% energy recovery. Separate conversion of cellulose and lignin could be one promising way to enhance the overall energy recovery from lignocellulose to liquid biofuels.

Keywords: Biorefinery; Fermentation; Hydrothermal liquefaction; Rice straw; Biofuels (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:200:y:2020:i:c:s0360544220306319

DOI: 10.1016/j.energy.2020.117524

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