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

Shengming Zhang, Tiehan Mei, Chonghao Zhu, Huimin Shang, Shushan Gao, Liyuan Qin and Haitao Chen
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Shengming Zhang: College of Engineering, Northeast Agricultural University, Harbin 150030, China
Tiehan Mei: College of Engineering, Northeast Agricultural University, Harbin 150030, China
Chonghao Zhu: College of Engineering, Northeast Agricultural University, Harbin 150030, China
Huimin Shang: College of Engineering, Northeast Agricultural University, Harbin 150030, China
Shushan Gao: College of Engineering, Northeast Agricultural University, Harbin 150030, China
Liyuan Qin: College of Engineering, Northeast Agricultural University, Harbin 150030, China
Haitao Chen: College of Engineering, Northeast Agricultural University, Harbin 150030, China

Energies, 2022, vol. 15, issue 10, 1-13

Abstract: 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.

Keywords: rice straw; pretreatment; liquid hot water; phosphotungstic acid; enzymatic hydrolysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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