Banca de QUALIFICAÇÃO: JÚLIO DE ANDRADE OLIVEIRA MARQUES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JÚLIO DE ANDRADE OLIVEIRA MARQUES
DATE: 03/11/2025
TIME: 09:00
LOCAL: LABTAM
TITLE:

Valorization of lignocellulosic by-products from red angico through fast pyrolysis: integrating pathways for the circular bioeconomy.

KEY WORDS:

analytical pyrolysis, bioproducts, biorefinery, bio-oil, residual biomass.

PAGES: 46
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Energia de Biomassa Florestal
SUMMARY:

The study evaluated the valorization potential of lignocellulosic residues generated after the sequential extraction of tannins and lignin from red angico (Anadenanthera colubrina) through fast pyrolysis, aiming to understand their chemical and thermal transformations and propose a sustainable technological route. This approach is scarcely explored in literature, especially for post-extraction materials of biocompounds, which reinforces the relevance of the research. The raw biomass underwent aqueous and alkaline extractions, generating by-products with distinct compositions that were subsequently characterized through physicochemical analyses and evaluated by analytical fast pyrolysis (Py-GC/MS). The extractions removed most of the extractives and lignin, both rich in phenolic compounds, resulting in material enriched in cellulose (~43%) and hemicellulose (~17%), as well as increasing the ash and alkaline oxide (CaO and K₂O) contents from ~6.2% to ~14.2%, compounds known for their catalytic potential in thermochemical processes. The pyrolysis at 500 °C (Py-GC/MS) of the post-extraction by-product showed a significant reduction in phenolic (~46 → 17%) and nitrogen-containing compounds, evidenced by the decrease in nitrogen content (10.5 → 3.8%) and the increase in ketones and alcohols derived from carbohydrate degradation. These results indicate the formation of more stable bio-oils with lower nitrogen content. Thus, the integration between extraction and pyrolysis proved to be a promising strategy for the full utilization of red angico, adding value to industrial by-products and contributing to a low-carbon bioeconomy aligned with policies such as the PNRS (National Solid Waste Policy) and the SDGs (Sustainable Development Goals).

COMMITTEE MEMBERS:
Presidente - 1979301 - RENATA MARTINS BRAGA
Externo à Instituição - JOSÉ LUIZ FRANCISCO ALVES - UFRN
Externa à Instituição - KARINE FONSECA SOARES DE OLIVEIRA - UFRN