Pré-tratamento organossolve de palha e sabugo de milho, e de palha e bagaço de cana-de-açúcar, visando a produção de etanol 2g ; Organosolve pretreatment of corn straw and cob, and sugarcane straw and bagasse, aiming at the production of 2g ethanol

The production of second-generation ethanol from agro-industrial residues, avoiding in this sense plant food sources, is an alternative to replace fuels and petroleum-derived products. When it comes to lignocellulosic materials for the production of 2G ethanol, there is a wide variety of biomasses, such as corn straw and cob and sugarcane straw and bagasse. However, due to the complexity of the material, it is necessary to carry out a pre-treatment of the biomass so that these structures become more accessible and then carry out the hydrolysis process, in the times of 24 hours, 48 hours and 72 hours, with a temperature of 50 °C and rotation of 150 rpm. In this work, an organosolve ethanol/water pretreatment with corn straw and cob and sugarcane straw and bagasse was carried out, in order to obtain a pulp rich in cellulose for later use in enzymatic hydrolysis and production of ethanol from second generation. The biomasses and pulps obtained were characterized as to their main chemical composition (cellulose, hemicelluloses, lignin). The pre-treated biomasses were submitted to the enzymatic hydrolysis process and the hydrolysis efficiency was initially evaluated in relation to the levels of total reducing sugars obtained. cellulose to fractionate, the corn cob showed a better reaction to the organosolve process with a good index of hemicellulose solubilization and cellulose availability, consequently, it caused a higher amount of total reducing sugars than the other evaluated biomasses, at any time evaluated in this work, having as optimal reaction point 72 hours. ; Dissertação (Mestrado) ; A produção de etanol de segunda geração a partir de resíduos agroindustriais, evitando sentido fontes vegetais alimentícias é uma alternativa para substituir combustíveis e produtos derivados do petróleo. Quando se trata de materiais lignocelulósicos para a produção do etanol 2G, encontra-se uma ampla variedade de biomassas, como é o caso da palha e sabugo do milho e da palha e bagaço da cana-de-açúcar. Entretanto, devido à ...