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Dissolution of wheat straw with aqueous NaOH/Urea solution

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Abstract

Aqueous NaOH/urea solution employed to dissolve lignocellulosic biomass is promising. In this work, wheat straw was found to be partially dissolved in the aqueous NaOH/urea solution, and the dissolved substances can be further flocculated by adding diluted sulfuric acid as a coagulating agent. The dependence of solubility of wheat straw on volume of NaOH/urea solution, concentration of NaOH, and dissolving duration and temperature was systematically investigated. Selected samples were characterized by Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), thermogravimetry (TG), scanning electron microscopy (SEM), and solid-state 13C nuclear magnetic resonance (13C-NMR). At optimal process condition, 61.22 wt% wheat straw dissolved in 50 ml NaOH/urea solution (NaOH:urea:H2O=10:9:81 wt%) within 2 h at −10 °C, and a cellulose-rich floccule containing 84.95 wt% holocellulose and 7.28 wt% lignin formed was obtained.

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Authors and Affiliations

  1. College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China

    Xiaobao Li, Judi Ye, Jianqiang Chen, Ji Yu, Minmin Ding & Jianguo Hong

Authors
  1. Xiaobao Li
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  2. Judi Ye
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  3. Jianqiang Chen
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  4. Ji Yu
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  5. Minmin Ding
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  6. Jianguo Hong
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Correspondence to Xiaobao Li or Jianguo Hong.

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Li, X., Ye, J., Chen, J. et al. Dissolution of wheat straw with aqueous NaOH/Urea solution. Fibers Polym 16, 2368–2374 (2015). https://doi.org/10.1007/s12221-015-3680-z

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  • DOI: https://doi.org/10.1007/s12221-015-3680-z

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