REVALORIZAÇÃO ENERGÉTICA DE RESÍDUOS DE JERIVÁ E O USO DA LIGNINA KRAFT COMO AGLOMERANTE

Abstract

This paper explores the Queen Palm residues energetic revalorization. The chosen pathway was briquetting with different kraft lignin proportions followed by slow pyrolysis under different temperatures. This document is segmented in two pappers: Briquetting and Slow pyrolysis. In the first paper the queen palm and kraft lignin characterization was initially performed through immediate, elemental and High Heating Values analysis. Next the briquettes were crafted under 15 MPa and temperature held at 140°C and also briquettes crafted at 120 oC with different kraft lignin concentration (0, 10 and 20%) used as biding agent. The briquette physical properties were accessed using density and dimensional stability test, as well as the mechanical properties using resistance to diametric compression test and friability test. It was noted that regardless of the kraft lignin concentration all treatments had proper dimensional stability. The briquetting increased the density at least 2,1 times, compared to the bulk density. The 20% kraft lignin addition increased the compressive resistance by 5,2 times and decreased the friability by 7,7 times. In the second paper the briquettes slow pyrolysis was performed using three different final temperatures viz: 400, 450 and 500 °C using 1,67 ºC.min-1 heating hate. The char coal, biooil and syngas gravimetric yield were accessed in each treatment. The char coal was submitted to immediate analysis and therefore the HHV estimated. The biooil was submitted to gas-chromatographic/mass spectrometry analysis in order to identify its major components. The average gravimetric yield went from 34,5% when no kraft lignin added to 35,9% and 37,6% with the 10% and 20% of kraft lignin addition respectively. The char coal average HHV was 31.73MJ.kg-1 which is 1,6 higher than that of the queen palm residues. The chromatographic analysis highlighted the presence of phenols, metil-phenols and metoxy-phenols in higher quantity in the treatments with the kraft lignin addition. In conclusion the lignin addition improved the briquettes energetic, physical and mechanical properties, the briquette pyrolysis bore a char coal with energetic potential and a biooil with potential uses in the chemical industry.