Caracterização química e energética da madeira e casca de Emmotum nitens (benth.) Miers

Abstract

In the present work has for objective to characterize and evaluate chemical and energy a wood and bark of Emmotum nitens (Benth.) Miers (Sobre). To this end, they collected three trees, being of each tree removed 5 discs at 0, 25, 50, 75 and 100% of the commercial height, these two opposing wedges were removed, one for the determination of the basic density and one for the determination of the chemical and energetic properties. The basic density was determined according to Norma Brasileira Reguladora - NBR 11941 and the tests of chemical and energetic analysis followed the NBRs 14853, 13999, 7989 and 8112. The holocelulose content was defined as the difference between the total chemical composition and the composition of the carbohydrate fraction, the high calorific value estimated according with equation established in literature and the energy density through product of the theoretical upper calorific value for basic density. The specie showed density of 0.55, 0.67 and 0.71g / cm³, ash content of 1.74, 0.37 and 0.20%, lignin content of 30.21, 20.71 and 20.80%, holocellulose content of 59.65, 70.66 and 67.91% extractives content of 8.39, 8.25 and 11.09%, high calorific value of 4589.32, 4305.59 and 4400.01 kcal / kg and energy density of 2521795,70, 2861335,85 and 3080749,14 Kcal/m³ to bark, sapwood and heartwood respectively. The bark have the best chemical and energetic properties followed by heartwood and sapwood, but the heartwood had higher viability of use as energy source followed by the sapwood and bark