4.6 Article

NaOH-Catalyzed Fractionation of Rice Husk Followed by Concomitant Production of Bioethanol and Furfural for Improving Profitability in Biorefinery

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APPLIED SCIENCES-BASEL
卷 11, 期 16, 页码 -

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MDPI
DOI: 10.3390/app11167508

关键词

pretreatment; biomass; hemicellulose; SSF; agricultural residue

资金

  1. R&D program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Ministry of Trade, Industry, and Energy (MOTIE), the Republic of Korea [20183030091950]
  2. Korea Evaluation Institute of Industrial Technology (KEIT) [20183030091950] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The alkaline fractionation of rice husk using NaOH can result in a hemicellulose-rich hydrolysate with a high glucan content, which is crucial for reducing enzyme dosage in enzymatic saccharification. The optimized process also allows for a high furfural production yield through acidification and heat treatment of the hydrolysate, showing potential for achieving high ethanol titers through a two-stage fed-batch fermentation process.
The alkaline fractionation of rice husk (RH) with NaOH was optimized for the purpose of obtaining a high-yield recovery of glucan and increasing the removal rate for lignin and ash, resulting in a hemicellulose-rich hydrolysate. The determined optimal conditions were a temperature of 150 degrees C, reaction time of 45 min, and NaOH concentration of 6% (w/v). The glucan content in the fractionated RH (Fr. RH) was 80.1%, which was significantly increased compared to the raw RH (35.6%). High glucan content in the fractionated solid residue is the most essential factor for minimizing enzyme dosages in enzymatic saccharification. The final enzymatic digestibilities (at 96 h) of raw and NaOH-Fr. RH with cellulase loadings of 30 FPU/g cellulose were 10.5% and 81.3%, respectively. Approximately 71.6% of the xmg content (mainly xylose) was concomitantly degraded into the fractionated hydrolysate (Fr. Hydrolysate). When this hydrolysate was acidified with sulfuric acid and subjected to heat treatment, a furfural production yield of about 64.9% was obtained. The results show that two-stage fed-batch fermentation with glucan-rich Fr. RH has the potential to achieve high-ethanol titers of 28.7 g/L.

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