No abstract

Arundo donax L. was submitted to a process of isothermal autohydrolysis in the temperature range of 150-195°C, for periods between 0 and 15 h and a liquid/solid ratio ) 8 g g -1 , for the purpose of hydrolyzing the hemicelluloses to oligomers (compounds which are of interest to the food industry) and monomers. A conventional kinetic model was developed that explains the evolution over time of the hemicelluloses and hemicellulose degradation products. Kinetic modeling was also carried out using the severity factor approach and the kinetic parameters obtained in these two ways have been compared.

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This paper will consider the influence of the autohydrolysis pretreatment on Paulownia fortunei L. woods to obtain a liquid phase (which can be used as a commercial source of organic reagents) and also a solid phase (which is valuable as raw material for pulping processes). Moreover, the influence of the operating conditionss viz., ethanol concentration (20%-60%), temperature (150-180 °C), and pulping time (30-90 min)son the organosolv pulping (the initial liquor-to-solid ratio was 8:1, with 10% of soda and 0.5% of anthraquinone) of the obtained Paulownia fortunei L. solid after the autohydrolysis process has been considered to determine the best pulping conditions and characteristics of the solid phase. In that form, the yield, kappa number, glucan and lignin contents, and tensile index values of the resulting pulps and paper sheets have been studied. The optimum of solubilized components has been obtained at 190 °C (0.92 g/L glucose, 1.61 g/L xylose, 0.60 g/L arabinose, 0.93 g/L acetic acid, 0.047 g/L 5-hydroxymethylfurfural, 0.141 g/L furfural, and 14.66 g/L oligomers). Under these conditions, a suitable chemical composition of pulps and acceptable yield (38%), kappa number (45), and tensile index (28.87 N m/g) could be obtained through operation at high temperature (180 °C), short pulping time (30 min), and low ethanol concentration (20%).