Obtaining of straw pulp in isobutanol medium
DOI:
https://doi.org/10.20535/1810-0546.2015.6.51145Keywords:
Wheat straw, Cellulose, Isobutanol, Anthraquinone, Hydrazine, Kinetic characteristics, Selectivity indicesAbstract
Background. Decreasing of wood consumption and hazardous wastes in environment due to ecologically safe methods of plant raw material delignification.
Objective. Identification of technological parameters influence on obtaining of organosolvent straw pulp and impact of catalysts (anthraquinone and hydrazine) on the delignification process, main quality indices of pulp, kinetic characteristics.
Methods. Pulping of organosolvent straw pulp with using of catalysts was performed in 0.25 dm3 steel autoclaves placed in glycerol bath heated at temperature 140–180 °C and 30–150 minutes duration.
Results. Obtained organosolvent straw pulp with anthraquinone and hydrazine catalysts are characterized by such physical and mechanical properties: breaking length – 7900–6900 m; burst index – 4.33–4.52 kN/g; folding strength – 128–600 double folds. It was established that using of hydrazine catalyst allows obtaining pulp with lesser lignin, ash and pentosans content then with anthraquinone. It was determined that delignification in isobutanol–KOH–water–catalyst system is described by second-order kinetic equation. Kinetic characteristics (reaction rate and energy of activation) of wheat straw delignification and characteristics of lignin removal from plant raw material were calculated.
Conclusions. Obtained organosolvent straw pulp is suitable for production of paper and cardboard products and after bleaching and alkali treatment – for further chemical treatment into different cellulose derivatives.
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