Estudo do conteúdo calorífico de ligninas extraídas de diferentes fontes de biomassa vegetal

Abstract

One of the advances of the new technologies applied in biorefineries tends to destructure the complex lignocellulosic of the plants, taking advantage of fractions of hemicellulose and cellulose, this generating a new organic byproduct: lignin. This macromolecule occupies the second position of most abundant vegetable organic material, responsible for about 30% of the carbons and 40% of the energy of the lignocellulosic materials. The present study aims to analyze and characterize thermodynamically, the lignins extracted five plants generating large quantities of lignocellulosic biomass in Brazil; cane sugar, eucalyptus, macaúba, mango and pineapple The methodology is based on two parts: the first involves the characterization of the materials in focus (lignins), with Lignin Content (KLASON), UV-Vis, MEV, FTIR, CHN, DRX and levels for ash and moisture, and the second, main object of this work, in determining the energy content of the samples, focused on TGA, DSC, Calorific Value and Total Organic Carbon (TOC). As the biomass plant is composed mainly of cellulose and lignin in almost 100%, in a second moment also correlates the results obtained with the energy content of the biomass (material) of origin of each lignin, making the assumption that the calorific content of the cellulose is constant, aiming at the calorific and energy utilization of these biomasses for application in the conversion of thermal energy.