Abstract:The use of biomass resources to generate energy has been growing as renewable alternative, foremost because of their promising properties. Nowadays, one of the newest alternative resources under study is the biomass from shortrotation forests. However, such process lacks development to be used in commercial scale in Brazil, despite its positive perspectives. The aim of the present study is to chemically characterize Eucalyptus sp. residues, in order to find their potential applicability as sustainable fuel. The material was collected in short-rotation forests in Taiobeiras, Minas Gerais State. Two treatments were tested, namely: residues collected in the harvester (T1) and 40-day-dried soil residues (T2). Firstly, the volatile matter and the ash content were analyzed in triplicate to determine the fixed carbon content. The results were 1.35%, 79.35% and 19.3%, in T1; and 1.30%, 80.60% and 19.2%, in T2, respectively. The extractive levels were 15.88%, in T1; and 12.37%, in T2. The lignin values reached 17.12% and 20%, in T1 and T2, respectively. The holocellulose a d α-cellulose levels were recorded and the hemicellulose level was found using the difference between the holocellulose a d α-ellulose alues. The holo ellulose ea hed .9 %, i T ; a d . %, i T ; he eas the α-cellulose presented values such as 40.64%, in T1; and 36.22%, in T2. Therefore, the hemicellulose content was 25.30% and 25.12%, in T1 and T2, respectively. Lastly, the calorific power levels were 18132.5 J/g and 18175.0 J/g, in T1 and T2, results that may be related to the chemical composition of short rotation timber.Keywords: Bioenergy; Lignin; extractives. ResumoO uso da biomassa para a geração de energia tem crescido como uma fonte renovável alternativa, especialmente devido à suas propriedades promissoras. Hoje em dia, um dos mais novos recursos alternativos em estudo é a biomassa de florestas de curta rotação. No entanto, este processo carece de desenvolvimento para ser usado em escala comercial no Brasil, apesar de suas perspectivas positivas. Este trabalho teve como objetivo caracterizar quimicamente resíduos de Eucalyptus sp. de curta rotação para determinar seu potencial como combustível renovável. Em Taiobeiras, Estado de Minas Gerais, foram coletados os resíduos de coleta mecanizada -colheitadeira -(Tratamento T1) e os resíduos depostos no solo (Tratamento T2) para secagem durante 40 dias. Realizou-se a análise imediata das amostras em triplicata para determinar teor de cinzas, voláteis e o teor de carbono fixo, resultando, respectivamente, 1,35%, 79,35% e 19,3% para T1; 1,30%, 80,60% e 19,2% para T2. Os valores de extrativos encontrados para T1 e T2 foram 15,88% e 12,37%, respectivamente. Para lignina, os valores encontrados foram de 17,12% para T1 e 20% para T2. Determinaram-se os teo es de holo elulose e α-celulose por diferença para obter o valor de hemicelulose. A holocelulose foi de 65,94% para T1 e 61,34% para T2, e ua to a α-celulose foi de 40,64% e 36,22%, respectivamente. Por diferença, a hemicelulose encontrada foi d...
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