Banca de DEFESA: KESLEI ROSENDO DA ROCHA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : KESLEI ROSENDO DA ROCHA
DATE: 14/03/2024
TIME: 14:00
LOCAL: NUPEG I - UFRN
TITLE:

Modifications to post-marketed polyurethane foams for sorption of oils spilled in seawater

KEY WORDS:

oil spill. Environment. Adsorption. Polymers.

PAGES: 153
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Operações Industriais e Equipamentos para Engenharia Química
SPECIALTY: Operações de Separação e Mistura
SUMMARY:

The exploration, transportation, and refining of oil are fundamental to the global economy. Occasionally, oil spills in the ocean are reported. Rapid containment and remediation are essential to prevent oil from being carried to the coasts by wind and wave action. The methods currently used to remove oils in water are not free of flaws, and because of that, constant research to develop alternative methods is necessary. In this context, this work proposed the use of post-consumer polyurethane foams to recover oils spilled in seawater. Surface modifications were carried out to increase the selectivity of foams for oils and resulted in increases up to 611% and 991% for modifications with MoS₂ and ZnO in systems with S46 lubricating oil and 20W40 engine oil, respectively. These results show the success of hydrophobization and lipophilicity added to the foams through the modifications made. The reuse and resistance to mechanical compression tests showed that even after 10 sorption/desorption cycles, the foams kept their oil recovery capacity without a statistically significant difference. This result demonstrates the economic potential of modified foams thanks to their high reusability capacity. Kinetic studies on seawater-oil systems showed that the saturation speed depends on the viscosity of the oil, but that the foam pores are saturated with fluids practically instantly and reach equilibrium in less than 40 seconds of exposure. The pseudo-second-order (Ho and McKay) and logistic (Richards and Verhulst) kinetic models were those (among all kinetics models studied) that most adequately described the behavior of the experimental data in all cases, presenting high coefficients of determination (R² > 0.97) and low sums of squared residuals. In continuous sorption, the modifications favored oil selectivity, but the vacuum pumping operating mode was the most relevant factor, reaching selectivity up to 90% for the spilled oil instead of seawater. After use in oil recovery, post-commercialized foams impregnated with oils can be used for co-processing in clinker kilns. In this way, part of the energy required for cement production is obtained by processing Refuse-Derived Fuel (RDF).

COMMITTEE MEMBERS:
Presidente - 1670497 - HUMBERTO NEVES MAIA DE OLIVEIRA
Interno - 1149554 - OSVALDO CHIAVONE FILHO
Externo ao Programa - 1213158 - ANDRE ANDERSON COSTA PEREIRA - UFRNExterno ao Programa - 277058 - GILSON GOMES DE MEDEIROS - UFRNExterno à Instituição - ALESSANDRO ALISSON DE LEMOS ARAÚJO
Externo à Instituição - MANOEL REGINALDO FERNANDES