A Combination Method of Liquid Hot Water and Phosphotungstic Acid Pretreatment for Improving the Enzymatic Saccharification Efficiency of Rice Straw

Chemical pretreatment can significantly improve the enzymatic hydrolysis efficiency of lignocellulosic biomass, thereby improving the yield of sugar materials for the production of cellulosic ethanol, but commonly used acid–base catalysts are difficult to recover and reuse. In this work, a combinati...

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Bibliographic Details
Published in:Energies (Basel) 2022-05, Vol.15 (10), p.3636
Main Authors: Zhang, Shengming, Mei, Tiehan, Zhu, Chonghao, Shang, Huimin, Gao, Shushan, Qin, Liyuan, Chen, Haitao
Format: Article
Language:English
Subjects:
Agricultural production
Biomass
Catalysts
Catalytic activity
Cellulase
Cellulose
Efficiency
Environmental impact
enzymatic hydrolysis
Enzymes
Ethanol
Fermentation
Fourier transforms
Glucose
Hemicellulose
Hot water
Hydrolysates
Hydrolysis
Lignin
Lignocellulose
liquid hot water
Methods
phosphotungstic acid
Pretreatment
Recycling
Rice
Rice straw
Saccharification
Straw
Sugar
Sulfuric acid
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Summary:Chemical pretreatment can significantly improve the enzymatic hydrolysis efficiency of lignocellulosic biomass, thereby improving the yield of sugar materials for the production of cellulosic ethanol, but commonly used acid–base catalysts are difficult to recover and reuse. In this work, a combination method of liquid hot water (LHW) and phosphotungstic acid (PTA) pretreatment was performed to improve the saccharification efficiency of rice straw, and we attempted to evaluate the reuse effect of PTA catalysts. The rice straw was first treated with LHW at 180 °C for 90 min, and then treated with 20 mM PTA at 130 °C for 60 min. After pretreatment, the cellulose hydrolysis efficiency and glucose recovery of the rice straw increased by 201.85% and 164.25%, respectively. Glucose accounted for 96.8% of the total reducing sugar in the final enzymatic hydrolysate. After each PTA pretreatment, approximately 70.8–73.2% of the PTA catalyst could be recycled. Moreover, the catalytic activity of the PTA catalyst that had been used five times did not decrease. The improved enzymatic saccharification efficiency was attributed to the removal of 89.24% hemicellulose and 21.33% lignin from the lignocellulosic substrate. The two-step LHW-PTA pretreatment could pretreat biomass in the field of cellulosic ethanol production.
ISSN:1996-1073
1996-1073
DOI:10.3390/en15103636