Aromáticos renováveis a partir da pirólise flash da lignina kraft.

• Autor(a) principal: Siqueira, Lorena Araujo de Melo
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/38306
• topic: lignina Kraft; biomassa; pirólise flash; aromáticos renováveis; kraft lignin; biomass; flash pyrolysis; renewable aromatics; CNPQ::CIENCIAS EXATAS E DA TERRA

With the growing interest in renewable and sustainable energy sources, biomass becomes an important alternative for the production of biofuels and bioproducts for the partial replacement of fossil fuels. Large quantities of lignin are produced by the Pulp and Paper Industry through the kraft process, making it one of the most available biomass source of aromatics in the world. This work has the purpose to characterize Kraft lignin and evaluate the yield of renewable aromatics at different flash pyrolysis temperatures. Biomass was characterized by ultimate and proximate analysis, high heating value, bulk density and thermogravimetric analysis. Analytical pyrolysis was developed at temperatures of 400, 500 and 600 degrees Celsius using a Py 5200 HP-R micro-pyrolyzer connected to the gas chromatograph. The results demonstrate that this biomass presents itself as a good source of energy, with a high calorific value, providing a greater thermal yield in the degradation process. However, this biomass presented a low content of volatiles for pyrolysis and a high content of ash. Pyrolysis products have the main formation of phenolic compounds and aromatic products with methoxy groups. The highest amount of phenolic compounds was obtained at 600 °C, but with the increase in temperature, there was a decrease in the amount of aromatics produced. Despite the low volatile content, the presence of aromatic compounds makes the study of Kraft lignin pyrolysis interesting because of its great potential as a renewable raw material for energy and chemical products of high added value.