Efeito da velocidade de carbonização na composição química do extrato pirolenhoso da madeira de eucalipto (Eucalyptus urophylla x Eucalyptus grandis) e Jurema Preta (Mimosa tenuiflora (Wild.) Poir.)

Abstract

Among the parameters used in the biomass carbonization process, the heating rate is one of the most important changes in the gravimetric yield of the products obtained. In face of it, the purpose of this study was to evaluate the influence of different heating velocities on the gravimetric yields in charcoal, condensable fluids and non-condensable gases. The eucalyptus (Eucalyptus urophylla x Eucalyptus grandis) and jurema preta (Mimosa tenuiflora (Wild.) Poir.) woods were used, shaped as disks with variable diameters and dried. The carbonization occurred in a muffle type electric oven for three distinct heating velocities: 0,7; 1,0 and 1,4 °C/min. The BioEstat software version 5.3 was employed to perform the normality test and Shapiro Wilk, ans subsequently the averages were compared by Tukey's test to the 5% significance level. The collected pyrollenous extract was analyzed by gas chromatography coupled to the mass. The results showed that as the heating rate increased, charcoal yields decreased and yields in condensable liquids increased. As well as the increase of the heating rate increased the furans and pyran content and decreased the content of phenolic compounds of the pyrolignous extract. With this, it is concluded that the choice of the heating rate should be carried out according to the main interest of the production.