Caracterização química da biomassa: potencial da palha da cana-de-açúcar para a produção de etanol de segunda geração

Abstract

Over time, biofuels have been gaining ground in the market, with the use of lignocellulosic residues as a promising alternative for their production. Among these residues, sugarcane straw stands out as the raw material for the production of secondgeneration ethanol (E2G). The use of straw in the E2G production process involves the harvesting steps, followed by the baling and storage of this biomass before its processing. Little is known about the influence of the type of storage of this raw material on its structural components. Therefore, this work has the objective of evaluating the effect of storage time on the structural carbohydrates of sugarcane straw and to compare the fermentability of this biomass by the yeasts Saccharomyces cerevisiae and Kluyveromyces marxianus, aiming the production of E2G. For this, three samples of straw with different storage times were collected. In the methodology, a chemical characterization of the straw was carried out, followed by hydrothermal pre-treatment, enzymatic hydrolysis and fermentation. The results obtained in the chemical characterization point to a similarity in the chemical composition of the three samples. Ethanol production was 2.011g / L with Saccharomyces cerevisiae, 1.794g / L with Kluyveromyces marxianus and 1.957g / L with the Mix of the two yeasts. The glucose consumption during fermentation was similar in the three fermentation conditions.