Advanced kinetic-based approach of multistep processes: The case of the pyrolysis of biomass-derived humins

Autor(es)

Gariboti, Julio Cesar de Jesus ; Macedo, Marina Gontijo Souza ; Gomes, Eliezer Ladeia ; Rueda-Ordonez, Yesid Javier ; Felisbino, Romilda Fernandez ; Tovar, Laura Plazas

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS; v. 166, p. 15-pg., 2022-07-08.

Resumo

The pyrolysis of sugarcane bagasse derived-humins (H-SCB) was evaluated in this work by considering inde-pendent, overlapping, or competing multistep reactions. An eight-stage parallel reaction model was used in the thermokinetic analysis. The most appropriate kinetic mechanism determined by the master-plot method showed that the second sub-stage proceeds via a 4th-order chemical reaction and the other steps are controlled by nucleation. Based on mathematical calculations, six consecutive-competitive reactions were studied and the modified Kilzer-Broido model was the most relevant to represent the pyrolysis of H-SCB. The kinetics is influ-enced by the reactivity of H-SCB in two parallel n-order reactions (n = 6.28 to volatile compounds and n = 1.35 to intermediate product). Diffusion-controlled reaction governed the secondary stage in the conversion to bio-char. Competitively, nuclei growth occurs and the intermediate product decomposes into volatile products. By using multistep reactions to account for pyrolysis products, the predicted kinetic profiles agreed well with the experimental data. (AU)

• Processo FAPESP: 15/20630-4 - Desenvolvimento integrado de biorrefinaria e planta de bioetanol de cana-de-açúcar com emissão zero de CO2: rotas para converter recursos renováveis em bioprodutos e bioeletricidade
• Beneficiário: Rubens Maciel Filho
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 20/11347-5 - Valorização termoquímica de huminas insolúveis derivadas da plataforma de conversão de açúcares C5 e C6
• Beneficiário: Marina Gontijo Souza Macedo
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica