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Optimization of sodium sulfide treatment of rice straw to increase the enzymatic hydrolysis in bioethanol production

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Abstract

The efficiency of sodium sulfide-assisted alkaline pulping for cellulose preparation from Oryza sativa L. rice straw in Vietnam for enzymatic saccharification was investigated. The response surface methodology was used for the determination of optimal technological parameters of alkaline pulping such as active alkali dosage, temperature and time. The optimal technological parameters were established to be active alkali dosage of 7%, treatment temperature of 100 °C and treatment time of 120 min. At these regimes, a maximal sugar yield of 51.8% (over dry rice straw) was obtained. It meant that the saccharification efficiency up to 97.1% could be achieved by using sodium sulfide-assisted alkaline pretreatment method. Addition of sodium sulfide into alkaline pretreatment resulted in higher sugar yield, higher level of depolymerization of lignin and less loss of cellulose. Moreover, liquid hydrolyzate after enzymatic hydrolysis was analyzed by HPLC to determine the compositions of sugar mixture. The fiber morphology in pretreated biomass solid was also revealed by SEM.

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Acknowledgement

The authors would like to thank Hanoi University of Science and Technology for supporting the fund for Project ID: T2016-LN-24 entitled “Study on conversion of rice straw to bio-ethanol and nanocellulose.”

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Authors and Affiliations

  1. School of Chemical Engineering, Hanoi University of Science and Technology, No. 1 Dai Co Viet Street, Hanoi, Vietnam

    Nguyen Thi Minh Phuong, Phan Huy Hoang, Le Quang Dien & Doan Thai Hoa

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  1. Nguyen Thi Minh Phuong
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  2. Phan Huy Hoang
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  3. Le Quang Dien
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  4. Doan Thai Hoa
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Correspondence to Phan Huy Hoang.

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Phuong, N.T.M., Hoang, P.H., Dien, L.Q. et al. Optimization of sodium sulfide treatment of rice straw to increase the enzymatic hydrolysis in bioethanol production. Clean Techn Environ Policy 19, 1313–1322 (2017). https://doi.org/10.1007/s10098-016-1329-2

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  • DOI: https://doi.org/10.1007/s10098-016-1329-2

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