Banca de QUALIFICAÇÃO: ENTONY DAVID DANTAS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ENTONY DAVID DANTAS
DATE: 23/07/2025
TIME: 09:00
LOCAL: Virtual
TITLE:

CO₂ Capture with Amines in Microsystems: Evaluation of Operational Conditions and Configurations for Post-Combustion Gas Treatment

KEY WORDS:

Chemical Absorption, Decarbonization, Microchannels, Monoethanolamine (MEA), Process Intensification

PAGES: 80
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Operações Industriais e Equipamentos para Engenharia Química
SPECIALTY: Operações de Separação e Mistura
SUMMARY:

The growing concern over climate change and the need to reduce greenhouse gas emissions have driven the development of technologies for carbon dioxide (CO₂) mitigation. Among the available alternatives, chemical absorption using monoethanolamine (MEA) stands out due to its high efficiency in removing CO₂ from gas streams. Although well-established at the industrial scale, this technology involves high operational costs, mainly associated with solvent regeneration. In this context, the application of microsystems emerges as a promising frontier, offering the potential for greater energy efficiency and cost reduction. This study aims to investigate the efficiency of CO₂ capture by amines in microsystems, evaluating different operational conditions and process configurations with a focus on optimizing the treatment of post-combustion gases. Experimental tests were conducted on three distinct microsystems, varying the following parameters: (i) MEA concentration (0.5, 1.0, 2.0, and 2.5 mol/L); (ii) gas/liquid ratio (15:1, 10:1, 5:1, and 1:1); (iii) channel diameter (0.6 mm and 0.9 mm); and (iv) reactor length (150 mm and 250 mm). Capture efficiency was assessed based on these factors, and the solution pH was monitored as an indirect parameter of amine saturation. Partial results indicated good reproducibility for gas/liquid ratios of 15:1, 10:1, and 5:1 across all concentrations tested in the three microsystems. Under certain conditions, efficiencies close to 90% in CO₂ removal were achieved. Higher MEA concentrations and longer reactor lengths favored capture, while increases in channel diameter and gas/liquid ratio negatively affected performance. pH analysis showed modest variations, suggesting that the amine was not saturated. These results reinforce the potential of microsystems as a viable and efficient alternative for intensifying CO₂ capture processes in post-combustion gas treatment applications.

COMMITTEE MEMBERS:
Presidente - 1584174 - DOMINGOS FABIANO DE SANTANA SOUZA
Interno - ***.656.434-** - CARLOS EDUARDO DE ARAÚJO PADILHA - UFRN
Interno - 1149554 - OSVALDO CHIAVONE FILHO
Externo à Instituição - JUAN ALBERTO CHAVEZ RUIZ - ISI-ER