Building an operational framework for pretreatment corn stover via sulfamic acid/NaCl and application
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ORIGINAL ARTICLE
Building an operational framework for pretreatment corn stover via sulfamic acid/NaCl and application Wanying Song 1 & Jiannan Li 2 & Yu Xiao 1 & Huan Chen 1 & Yang Sun 1 & Sitong Zhang 1 & Yanli Li 1 & Guang Chen 1,3 & Gang Wang 1,3 Received: 18 June 2020 / Revised: 18 August 2020 / Accepted: 19 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The profitability and sustainability of future biorefineries are dependent on efficient feedstock use. Therefore, it is essential to improve the lignocellulosic utilization efficiency when using lignocellulosic biomass. In this research, a novel corn stover (CS) pretreatment process was established and the effectiveness was verified via D-lactic acid fermentation. The results indicated that after pretreatment with 4% sulfamic acid and 3% sodium chloride solutions (SA/NaCl) at 80 °C for 60 min, and enzymatic hydrolysis with 20 FPU/g cellulase for 72 h, the glucose concentration was14.57 g/L, the cellulose transformation rate was 97.56%, and 56.93% of the solid recovery rate. The concentration of D-lactic acid reached 45 g/L after fermentation for 72 h at 42 °C. In conclusion, SA/NaCl was a safe to use, easy to transport, and more promising CS pretreatment catalyst than sulfuric acid and hydrochloric acid. Keywords Sulfamic acid . pretreatment . enzymatic hydrolysis . compositional change . D-lactic acid
1 Introduction Lignocellulosic is the most abundant renewable biomass resource for sustainable biorefineries of low-carbon footprint chemicals [1]. There are approximately 700 million tons per year of crop straw in China. The production of low-carbon footprint chemicals from lignocellulosic biomass materials has great potential for development in the light of increasing energy shortage and environmental protection [2–5]. However, the complex three-dimensional structure and interactions among cellulose, hemicellulose, and lignin in corn stover avoid the biochemical conversion of lignocellulose that leads to straw burning and environmental pollution. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13399-020-00975-9) contains supplementary material, which is available to authorized users. * Gang Wang [email protected] 1
College of Life Science, Jilin Agricultural University, Jilin 130118, China
2
Department of Orthopaedic Surgery, School of Medicine, Stanford University, Stanford, CA 95306, USA
3
Key Laboratory of Straw Biology and Utilization, Education Ministry of China, Jilin Agricultural University, Jilin 130118, China
Therefore, to develop the high efficiency pretreatment techniques to disassemble the compact lignocellulosic structure and improve the enzymatic digestibility of CS is a committed step [6]. After decades of continuous development, a variety of pretreatment methods have been proposed to hydrolyze recalcitrant components. Such as acidic solutions pretreatment [7, 8], mildly alkaline solutions pretreatment [9, 10], diluted alkaline solutions pretreatment [11],
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