Banca de QUALIFICAÇÃO: OTAVIO LIMA DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : OTAVIO LIMA DA SILVA
DATE: 22/07/2025
TIME: 14:30
LOCAL: Via Google Meet
TITLE:

SYNTHESIS OF CELLULOSE ACETATE POLYMER MEMBRANES FROM GREEN COCONUT SHELL FIBER FOR CO₂ CAPTURE

KEY WORDS:

Cellulose acetate; green coconut shell; CO₂ capture; membranes

PAGES: 42
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Processos Industriais de Engenharia Química
SPECIALTY: Processos Bioquímicos
SUMMARY:

Due to intense urbanization and industrialization, greenhouse gas (GHG) emissions have increased rapidly, particularly carbon dioxide (CO2), which has become the main contributor to the worsening of the greenhouse effect. Carbon Capture, Utilization, and Storage (CCUS) technologies have been developed and adopted in the production sector to mitigate the damage caused by the greenhouse effect. These technologies can capture up to 90% of the CO₂ emitted in industrial processes, such as electricity generation, cement production, fertilizer production, etc. The use of amine-based solvents such as monoethanolamine (MEA), ionic liquids, metal-organic frameworks (MOFs), zeolites, and polymeric membranes are some examples of technologies applied to CO₂ capture. The membrane separation process (MSP) offers numerous advantages for industrial-scale application, such as low energy consumption and the possibility of being combined with other separation processes. In this sense, cellulose-based polymers, such as cellulose acetate (CA), have become advantageous for use in the synthesis of separation membranes. CA membranes are preferred for their hydrophilic properties and chemical and mechanical stability. Their high chemical affinity for CO₂ allows them to be used in CO₂ capture processes and for natural gas/methane purification, as well as hydrogen recovery and nitrogen generation. One alternative for obtaining this polymer is the use of agro-industrial waste, such as coconut husk fiber, due to its high cellulose concentration. The fiber will be subjected to physical (grinding) and chemical (oxidative alkaline) pretreatment to break and remove the lignin chains. The membranes will be synthesized using the non-solvent induction phase inversion (NIPS) process and evaluated in gas permeation cells using a binary CO₂/CH₄ mixture. Thus, this work proposes as an objective to synthesize and evaluate polymeric membranes of cellulose acetate from green coconut shell with possible application for capturing CO₂ from natural gas.

COMMITTEE MEMBERS:
Presidente - 1346198 - EVERALDO SILVINO DOS SANTOS
Interna - 3214434 - NATHALIA SARAIVA RIOS
Externa ao Programa - 1218001 - LIANA FRANCO PADILHA - UFRN