Influence of reaction parameters on the depolymerization of H2SO4-impregnated cellulose in planetary ball mills

• Optimal filling degree was identified.
• Increased solubility in larger milling beakers
• Identification of optimal combination of milling ball filling degree and diameter.
• Depolymerization obeys a first order model.

The depolymerization of acid-impregnated cellulose in planetary ball mills was investigated under the perspective of the influence of reaction parameters. Several process, technological and chemical parameters were examined. It was found that with a higher rotation frequency νrot, smaller milling balls and a milling ball filling degree ΦMB of approximately 0.3, the highest solubility could be reached and the milling time could be reduced. The use of milling vessels with larger diameter was beneficial. Variation of the milling ball material showed huge influence and a linear correlation between solubility and density of the milling ball material was observed. Kinetic investigations indicate that the degradation of the impregnated cellulose follows a first order model.

Planetary ball mills: The depolymerization of acid-impregnated cellulose was investigated in planetary ball mills whereby special focus was set on the influence and optimization of reaction parameters.Figure optionsDownload as PowerPoint slide