Estudo do Alcatrão e Vinagre da madeira obtidos por pirólise das espécies corymbia citriodora, Mangifera indica e trichilia emetica

Abstract

Lignocellulosic biomass has been used partially or as the sole source of heat by micro and large industries, as well as in households in our country. Slow pyrolysis/carbonization of wood is characterized by the production of charcoal, non-condensable gases and the production of tar and wood vinegar. As one of the ways to prevent environmental contamination and reuse tar and wood vinegar. In this study, tar and vinegar were extracted from the bark and wood of Corymbia citriodora, Mangifera indica and Trichilia emetica and the statistical test ANOVA and TUKEY test were applied to verify the significant difference between them. Using Gas Chromatography coupled with Mass Spectrometry techniques, the volatile and semi-volatile components of Tar and Vinegar from the Bark and Wood of Corymbia citriodora were identified, and the Bark and Wood of Corymbia citriodora were characterized by Thermogravimetric Analysis. The extraction results obtained were (21.93 ± 1.90)%, (19.44 ± 2.36)% and (14.95 ± 2.23)% for the bark of Corymbia citriodora, Mangifera indica and Trichilia emetica respectively and (22.75 ± 2.26)%, (25.72 ± 4.28)% and (23.41 ± 3.53)% for the wood of Corymbia citriodora, Mangifera indica and Trichilia emetica respectively. The yields among the barks of Corymbia citriodora, Mangifera indica and Trichilia emetica are significantly different, and the yields among the woods of Corymbia citriodora, Mangifera indica and Trichilia emetica are not significantly different. In the derived thermogravimetry curves, a large mass loss of ~40.7% was observed for the bark and ~58.02% for the wood of Corymbia citriodora, with the highest peak of mass loss being at a temperature of ~350 ºC for both samples. Long-chain alkanes, phthalic acid derivatives, pyrocatechol derivatives and bicyclo were identified in the vegetable tar of the bark of Corymbia citriodora. Derivatives of phenol, pyrocatechol and derivatives, guaiacol and derivatives, benzene derivatives, ketones, esters and nitrogenous compounds were identified in the tar of the wood of Corymbia citriodora. For the crude vinegar of the bark of Corymbia citriodora, nitrogenous compounds, furan derivatives, guaiacol and derivatives, phosphonic acid derivative, ketone, carboxylic acid and syringol were identified. In the crude vinegar from Corymbia citriodora wood, furan derivatives, ketones, syringol and derivatives, guaiacol and derivatives and benzene derivatives were identified. The tar from the bark and the wood of Corymbia citriodora were different, and it was not possible to compare the crude vinegar obtained from the bark and wood of Corymbia citriodora.