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Vol. 26 No. 16 (2014): Vol 26 Issue 16

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Study on Sawdust Dissolution and Component Separation in NaOH/Thiourea/H2O System

https://doi.org/10.14233/ajchem.2014.16300
Li Zhang
Jilin Provincial Engineering Laboratory for the Complex Utilization of Petroresources and Biomass, Changchun University of Technology, Changchun 130012. P.R. China
Jianguo Xu
Jilin Provincial Engineering Laboratory for the Complex Utilization of Petroresources and Biomass, Changchun University of Technology, Changchun 130012. P.R. China
Long Zhang
Jilin Provincial Engineering Laboratory for the Complex Utilization of Petroresources and Biomass, Changchun University of Technology, Changchun 130012. P.R. China

Corresponding Author(s) : Long Zhang

zhanglongzhl@163.com

Asian Journal of Chemistry, Vol. 26 No. 16 (2014): Vol 26 Issue 16

Abstract

The dissolution of sawdust in alkaline solvent system composed of NaOH/thiourea/H2O was reported and the separation of the lignocellulosic ingredients combined with acid precipitation and ethanol extraction methods was proposed. Structures of the component separated were elucidated by the combination of fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The spectra of FT-IR and 13C NMR demonstrated that the residual after the treatment with alkali solvent was lignin, the precipitate by the acid precipitation of the liquor was cellulose, the solid precipitate by adjusting pH to 12 and ethanol extraction of the liquor which achieved by above operation was hemicellulose. X-ray diffraction patterns revealed that new crystals were formed or some crystals were redirected after the treatment in alkali system. Molecular structure has changed and intra-molecular rearrangement occurred after treatment in alkali system and by acid precipitation and alcohol extraction. The optimal dissolution conditions were determined by single-factor experiment as follows: the liquid-solid ratio, dissolution temperature and dissolution time was 30:1, 70 °C and 2 h, respectively. The lignin, cellulose, hemicellulose recovery yield can achieve to 88.3, 95.2 and 85.6 % under the optimal dissolution conditions.

Keywords

Lignocelluloses Alkali solvent system Dissolution Component separation
Zhang, L., Xu, J., & Zhang, L. (2014). Study on Sawdust Dissolution and Component Separation in NaOH/Thiourea/H2O System. Asian Journal of Chemistry, 26(16), 5039–5044. https://doi.org/10.14233/ajchem.2014.16300
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