Banca de DEFESA: JÉSSICA MARIA GUIMARÃES DE ASSIS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JÉSSICA MARIA GUIMARÃES DE ASSIS
DATE: 04/04/2024
TIME: 14:00
LOCAL: Mini-Auditório Campus Nova Suíça
TITLE:

Carbonization of Amazonic Biomass: Characterization of extractives and prospection of substances of interest in coproducts from charcoal production

KEY WORDS:

sustainable steel industry, charcoal, atmospheric effluents

PAGES: 99
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

This work was dedicated to the investigation of compounds present in the extractives of selected native Amazonian biomass (from residues from certified sustainable forest management) and in the co-products of the charcoal production process from these woods. The samples were collected in the Rio Capim forest management area (FMA Rio Capim), in the municipality of Paragominas, Pará. Confirmation of the wood species was carried out in the Wood Library of the Embrapa Amazônia Oeste botany laboratory in Belém (PA). Initially, wood characterization tests were carried out to evaluate its application for charcoal production. Subsequently, extraction procedures were carried out from the ground biomass using acetone, hexane, toluene and ethanol (2:1), in addition to a reduced-scale carbonization test, with the aim of identifying substances of commercial interest that can be recovered and isolated. . The results obtained for the Amazonian residual biomass studied showed levels of lignin, holocellulose, volatile materials, ash content, fixed carbon content and higher calorific value consistent with the literature review for use as an input in the production of charcoal. The data obtained for Spectroscopy in the infrared region with Attenuated Total Reflectance and Fourier Transform (ATR-FTIR) for residual biomasses presented, aliphatic group of cellulose and hemicellulose, carbonyl group, aromatic groups and groups belonging to xylans, derived from carbohydrates found in hemicellulose, for charcoal the ATR-FTIR spectrum showed aromatic groups. The Thermogravimetric analysis (TGA) for biomass showed greater mass loss (79.0%) occurring around 350 °C, and TGA test for coal observed greater mass loss (60%) around 450 °C . Understanding the compounds present in biomass extractives presents opportunities for applications in different areas of activity, valuing the potential of lignocellulosic residues from sustainable forest management. It was possible to identify substances with varied applications, especially pharmaceutical applications. Among the compounds found with applications described in the literature, the following can be mentioned: hexadecanoic acid, which acts to reduce the process of development of hepatocellular carcinoma; behenic alcohol, which has significant antibacterial activity, especially against strains associated with pneumonia, such as Klebsiella and Staphylococcus aureus; and, 1-ethyl-3-methyl-benzene, which has antifungal properties and notable antibacterial characteristics. It is also worth mentioning the compound guaiacol, one of the compounds with the highest concentration in the extracts studied, which is widely used in medicine for the synthesis of guaiacol benzoate, presenting applications as a local anesthetic or antiseptic, and in the preparation of oral solutions for expectoration and treatment of indigestion. . This study reinforces the importance of recovering condensable vapors present in atmospheric effluents from coal production, making it possible to obtain the co-products vegetable tar and pyroligneous extract, in addition to the potential to obtain and extract compounds of interest present in them that may have nobler uses. Knowing the potential of this practice and the composition of co-products is essential to stimulate and promote the widespread adoption of this circular economy practice, which could play a vital role in significantly reducing atmospheric emissions, resulting in an immediate and tangible improvement in air quality. regional. The reintegration of co-products into the commercial chain not only represents an advance in the management of atmospheric effluents, but also presents considerable bioeconomic potential. This potential is particularly significant for the Amazon region, where it can significantly contribute to the sustainable development objectives outlined in items 3, 8, 9, 10, 11, 12 and 13.

COMMITTEE MEMBERS:
Presidente - PATRICIA SUELI DE REZENDE
Interna - ADRIANA AKEMI OKUMA
Interna - LUZIA SERGINA DE FRANCA NETA
Interna - PRISCILA PEREIRA SILVA CALDEIRA
Externo à Instituição - GILBERTO ALVES ROMEIRO - UFF
Externa à Instituição - ANA CLARA CAXITO