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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
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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Abstract

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
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MDPI and ACS Style

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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