Banca de DEFESA: HEITOR BRUNO BARBOSA DE AZEVEDO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : HEITOR BRUNO BARBOSA DE AZEVEDO
DATE: 11/10/2024
TIME: 10:00
LOCAL: Auditório LABEC EAJ
TITLE:

Characterization of a bioadditive for well cementing derived from the by-product of tannin extraction

KEY WORDS:

Bioadditive, Lignosulfonate additive, Anadenanthera colubrina, Anacardium occidentale L., lignocellulosic byproduct.

PAGES: 60
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUMMARY:

The inadequate management of agro-industrial waste is a growing challenge, especially in Brazil, where the by-product of tannin extraction, abundant in lignocellulosic materials, represents an opportunity for generating bioenergy and bioproducts. The aim of this study was to develop and characterize a bioadditive from the lignocellulosic by-product of tannin extraction from Anadenanthera Colubrina, for application in cement pastes used in oil wells. The lignocellulosic by-product was characterized by Fourier transform infrared spectroscopy (FTIR), UV spectrophotometry, thermogravimetric analysis (TGA/DTG), compositional analysis to determine the content of extractives, cellulose and hemicellulose; and lignin by the Klason method to isolate lignin. The bioadditive was synthesized using sodium hydroxide (NaOH) with persulfate, using alkaline routes. The effectiveness of the bioadditive was evaluated in cement pastes using rheological and consistometry tests, focusing on the retarding effect on setting time and the concentration of the additives. The results obtained highlight the viability of lignocellulosic waste as a sustainable resource in the formulation of additives for industry and technological innovation.

COMMITTEE MEMBERS:
Interna - 1979301 - RENATA MARTINS BRAGA
Externo à Instituição - AGEU DA SILVA MONTEIRO FREIRE
Externa à Instituição - CLEITIANE DA COSTA NOGUEIRA
Externa à Instituição - ELANIA MARIA FERNANDES SILVA