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In this work, Leucaena leucocephala K366 was characterized chemical and energy terms, and assessed its potential as a lignocellulosic raw material and energetic and industrial crop specie, and its integral fractionation by autohydrolysis by evaluating its calorific value, holocellulose, glucan, xylan, araban, lignin and oligomers and monomers contents in autohydrolysis liquor and solid phase. Also, this paper will consider the influence of the temperature and time of autohydrolysis process from Leucaena leucocephala K366 to obtain a valuable liquor and a suitable solid phase to produce energy by combustion. A valuable liquor was obtained from the autohydrolysis of Leucaena leucocephala K366 by simultaneously using operating temperatures and times in the medium-high ranges studied, namely: 172--30 min. The optimum processing conditions provided an acceptable yield (16-26%), and high xylose and xylo-oligomer contents in the liquor (10.0 and 58.6%, respectively, of the amounts present in the starting raw mate fraction was extracted virtually completely ─only 8.3% remained in the solid fraction─, and the acetyl group fraction was recovered in full. In addition, these conditions reduced the glucose content of the liquor to 2.9% of the amount present in the raw material while largely preserving the integrity of cellulose fibers.Klason lignin was scarcely dissolved under the operating conditions of the auto¬hydrolysis process. This increased the calorific value of the solid phase by 9% (under the most drastic operating conditions) with respect to the starting raw material. AbstractIn this work, Leucaena leucocephala K366 was characterized chemical and energy terms, and assessed its potential as a lignocellulosic raw material and energetic and industrial crop specie, and its integral fractionation by autohydrolysis by evaluating its calorific value, holocellulose, glucan, xylan, araban, lignin and oligomers and monomers contents in autohydrolysis liquor and solid phase. Also, this paper will consider the influence of the temperature and time of autohydrolysis process fromLeucaena leucocephala K366 to obtain a valuable liquor and a suitable solid phase to produce energy by combustion.A valuable liquor was obtained from the autohydrolysis of Leucaena leucocephala K366 by simultaneously using operating temperatures and times in the medium-high ranges studied, namely:172-184 C and 15-30 min. The optimum processing conditions provided an acceptable yield (16-26%), and high xylose and xylo-oligomer contents in the liquor (10.0 and 58.6%, respectively, of the amounts present in the starting raw material when operating at 184 C for 30 min). The araban fraction was extracted virtually completely ─only 8.3% remained in the solid fraction─, and the acetyl group fraction was recovered in full. In addition, these conditions reduced the glucose content of the liquor to 2.9% of the amount present in the raw material while largely preserving the integrity of cellulose fibers.Klason lignin was scarcely dissolved under the o...

The chemical characteristics of tagasaste trimming wood and eucalyptus wood are similar in ash, holocellulose, lignine, xylan, and acetyl groups. Then, tagasaste wood could be an adequate raw material for pulp and paper making. Therefore, the influence of independent variables in the pulp processing of tagasaste with ethanol-water mixtures (ethanol concentration, time, pulping temperature, wash temperature, and disintegrate temperature) on various properties of the pulp (yield, kappa number, viscosity, brightness, and stretch related properties of paper sheets) was studied to determine the best processing conditions to obtain quality pulp and paper sheets. Using medium to high (185-200 °C) pulping temperatures and ethanol concentration (60-80%), suitable physical characteristics of paper sheets and an acceptable yield, the kappa index, and viscosity could be obtained. Wash and disintegrate temperatures have an influence on all the dependent variables, especially on the yield and the tensile index. A high wash temperature and a disintegrate temperature must be used in order to ensure that the pulp and the resulting paper sheets will possess optimal properties.