Estudo de pré-tratamento ácido do fruto da terminalia catappa linn para produção de etanol de segunda geração

Abstract

Due to the oil crisis, the ethanol industry has developed rapidly in recent years to deal with the depletion of fossil fuels. Ethanol from renewable raw materials (bioethanol) has been of great interest in recent decades as an alternative fuel. There, this paper aims to study the acid pretreatment of Terminalia catappa Linn fruit for a second generation ethanol. The methodology of the studied variables of interest were the concentration of sulfuric acid (2.5% and 5%), the concentration of biomass (waste 5g / 100 ml of acid solution) and heating time (15 min to 30 min) at temperatures ranging from 111º C to 120º C, organized in a 23 factorial design with three replications samples. In the ethanolic fermentation, the pretreatment sample solution and the mineral Saccharomyces cerevisiae yeast were utilized having ethanol concentration and fermentation efficiency as main responses. The increased fermentation efficiency was given for the test that had the highest acid concentration (5.0%), time (30 minutes) and temperature (120 ° C) as well as the the highest amount of ethanol. The produced ethanol content was 14, 27 g / L and had a fermentation efficiency of 59%. The Ethanol production has compatible values with the ones found in the literature, so, the study group of this acid pre-treatment of the fruit of Terminalia catappa Linn, for a second generation ethanol production proved to be promising.