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Molecules 2009, 14(12), 5027-5041; doi:10.3390/molecules14125027

Dissolution of Microcrystalline Cellulose in Phosphoric Acid—Molecular Changes and Kinetics

1, 1, 1,* , 1, 1, 2, 3 and 3
1 Department of Resources Science and Engineering, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong Province, China 2 Department of Paper and Bioprocess Engineering, College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, NY 13210, USA 3 College of Medicine and Life Science, Nanjing University of Technology, Nanjing, 210009, China
* Author to whom correspondence should be addressed.
Received: 4 November 2009 / Revised: 23 November 2009 / Accepted: 30 November 2009 / Published: 4 December 2009
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In this study, we aimed to dissolve microcrystalline cellulose (MCC) with phosphoric acid to obtain high-quality fermentable saccharides. MCC was directly dissolved in phosphoric acid (the concentration was 83%) for 10 hours at temperatures of 30, 50, and 70 °C. The structural changes of MCC were determined in detail with X-ray powder diffraction, solid-state cross-polarization magic angle spinning 13C-NMR, and X-ray photoelectron spectroscopy. The kinetics of MCC decrystallization during treatment with phosphoric acid was also compared at 30, 50, and 70 °C. With the assumption of first order kinetics, the Arrhenius parameters of K, A0 and Ea were calculated. The rate constants of decrystallization reaction (K) were 0.06, 0.17, and 0.12 h-1 respectively. The pre-exponential factor (A0) was 1.2 × 106 h-1, and the activation energy (Ea) was 42.4 kJ/mol.
Keywords: kinetic; MCC; phosphoric acid; decrystallization; structural change kinetic; MCC; phosphoric acid; decrystallization; structural change
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Zhang, J.; Zhang, J.; Lin, L.; Chen, T.; Zhang, J.; Liu, S.; Li, Z.; Ouyang, P. Dissolution of Microcrystalline Cellulose in Phosphoric Acid—Molecular Changes and Kinetics. Molecules 2009, 14, 5027-5041.

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