2010•Journal of Shaanxi University of Science & TechnologyRequires access
A Kinetic Equation of Microcrystalline Cellulose Dissolving in Phosphoric Acid
Jingqiang Zhang, Qingchun Li, Lu Lin, Shijie Liu, Pingkai Ouyang
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Abstract
Phosphoric acid was a potential pretreatment solvent of lignocellulose in mills of bio-ethanol or biobased chemicals. Microcrystalline cellulose (MCC) was dissolved in phosphoric acid (the concentration was 83.03%) for 10 hours at temperatures of 30, 50, 70℃, samples were prepared every 30 minutes. XRD analysis showed the crystalline diffraction peaks decreased much, and the corresponding crystalline degree also induced markedly. The high temperature accelerated the rate of cellulose dissolving in phosphoric acid. At the relative low temperature, the kinetic behaves of cellulose dissolving in phosphoric acid obeyed equation of ln 1/1-Tt kr well, the constants of decrystallization reactions at the temperatures of 30, 50, 70℃ were 0.0595, 0.165 0, 0.1163 h^(-1), the activation energy was 42.40 kJ/mol.