Comparative properties of the pulp and paper obtained from kraft-ethanol and kraft-ethylene glycol processes

Abstract

The Study investigates the effects of ethanol or ethylene glycol addition, during, conventional kraft cooking, oil the properties of pulp and paper sheets. After optimization of the kraft pulping conditions according to the ratio of chemicals, cooking temperature and time, with Pinus nigra subsp. pallasiana as a raw material, ethanol or ethylene glycol, in concentrations of 10%, 20%, 30% and 40%, was added to the kraft cooking liquor. The experiments were repeated with anthraquinone as a catalyst. The pulp yields were not significantly changed when the delignification ratio was increased by adding ethanol to the conventional kraft cooking. Addition of ethylene glycol to the conventional kraft cooking liquor had a positive impact on the physical and mechanical properties of the paper sheets. On the other hand, addition of anthraquinone to the kraft-solvent cooking media had no effect on the pulp and paper properties.