Pré-tratamento ácido da biomassa palha mais bagaço de cana-de-açúcar

Abstract

The use of agroindustrial residues as lignocellulosic sources to obtain various chemical inputs is an alternative to contribute to the valorization of these by-products. In this context, ethanol produced from lignocellulosic materials becomes an interesting option to increase the production of this fuel without increasing the planted area of the crops used for its production, since the demand for ethanol has been increasing in recent years, with the aim of replacing oil and its derivatives, contributing significantly to the reduction of negative impacts to the environment, such as global warming caused by the burning of fossil fuels. In order for the production of cellulosic ethanol to be economically viable, it is necessary that these lignocellulosic sources be fractionated in order to provide the largest amount of carbohydrate possible for the alcoholic fermentation process. In this work, it was proposed to evaluate the chemical pre-treatment of the bagasse mixture plus sugarcane straw, in the natural and pretreated forms, in order to verify the effect of pre-treatment with dilute sulfuric acid at concentrations 1%, 1.5% and 2% (v / v) at temperatures of 80, 100 and 120 ° C and reaction times 60, 90, 120 minutes. Pretreatment with 1% of sulfuric acid found cellulose content, hemicellose and lignin of 42.15; 6.41 and 20.16% respectively for each 100 g of mixture. For the conditions of 1.5%, it was found 39.59% for cellulose, 8.27% for hemicellose and 20.16% for lignin and for the condition of 2.0% was found 33.82% for cellulose, 8.72% for hemicellose and 16.56% for lignin. Thus, it was possible to observe the feasibility of using the straw blend plus sugarcane bagasse in the pretreatment, for a possible second generation ethanol production, which would allow the increase of the production of biofuels from renewable sources and sustainable development.