Banca de QUALIFICAÇÃO: PAULO HENRIQUE ALVES DE AZEVEDO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : PAULO HENRIQUE ALVES DE AZEVEDO
DATE: 12/07/2024
TIME: 14:30
LOCAL: Google meet
TITLE:

Obtaining Formulations Based on Oily Water and Amino Surfactant for CO2 Capture

KEY WORDS:

CO₂, global warming, amino surfactant, oily water, CCS.

PAGES: 104
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Petróleo e Petroquímica
SUMMARY:

In today's world, there is growing concern about the problems triggered by climate change. Global warming has promoted negative consequences across the entire surface of the globe, with carbon dioxide (CO₂) labeled as the main responsible for the aforementioned problem. The energy matrix anchored in fossil fuels has led to an unprecedented increase in CO₂ levels in the atmosphere. In view of this, CO₂ Capture and Storage (CCS) technologies have emerged with the promise of mitigating, in the short term, the levels of CO₂ accumulated in the air. Absorption has been the most used technique to capture CO₂ in post-combustion processes, in which the established absorbent liquids are alkanolamines, such as MEA (methylethanolamine) and MDEA (dimethylethanolamine). Although these substances promote the rapid absorption of CO₂, toxicity, thermal instability, among other operational problems, have directed research in search of new, more sustainable absorbent liquids. Once CO₂ has been absorbed into the liquid, mineralization can occur, which consists of the reaction of carbonate anions, originating from CO₂, with metallic cations, such as calcium and magnesium, resulting in the formation of a stable solid. Base formulations containing water, oil (petroleum) and amino surfactant were developed to capture CO₂ through absorption and mineralization in ambient conditions. An experimental design was carried out using the PCC model, with the aim of finding the optimized conditions of oil concentration, surfactant concentration and temperature that would promote the lowest rate of release of CO₂ after its absorption. Salts (NaCl, CaCl₂.2H₂O, MgCl₂.6H₂O e K₂SO₄), amino acid (lysine) and disaccharide (sucrose) were added to the formulations in order to investigate the influence on carbon capture. The saline formulation (produced water mimic) was used to promote the mineralization of CO₂ into carbonates by adjusting the pH to basic values (8,9,10,11 and 12), using 1 M NaOH solution, with and without surfactant. The precipitates obtained were treated and characterized by SEM, XRD and FTIR. The results showed the exclusive formation of calcite. Therefore, this work brings the perspective of using oily and saline effluents, such as produced water, added with surfactant, to capture the gas reiterated in industrial combustion processes.

COMMITTEE MEMBERS:
Presidente - 1753094 - ALCIDES DE OLIVEIRA WANDERLEY NETO
Interno - ***.674.113-** - DENNYS CORREIA DA SILVA - UFRN
Interno - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Externo ao Programa - 1198847 - JOSE LUIS CARDOZO FONSECA - UFRN