abstract
In the pursuit of advanced carbon capture methods, ionic liquid (IL)-based membranes have emerged as promising materials for CO2 separation due to their high permeation and selectivity. This research focuses on the development of composite membranes with highly CO2 selective ethanolamine-based ionic liquids and poly(vinyl alcohol) (PVA). ILs and membranes were characterized by water content, FT-IR, H-1, and C-13 NMR. The addition of ethanolamine-based ILs and stream humidification promoted an outstanding increase of PVA membranes' CO2 permeability and CO2/CH4 selectivity of 53x and 36x, respectively. Effects of transmembrane pressure (1.0 to 3.0 barg), temperature (313.15 to 343.15 K), and CO2:CH4 ratio (10 to 40%) were studied. Effects of IL's cations and alkyl chain length (anion) on CO2 separation performance were studied via the production of PVA membranes with seven ethanolamine-based ILs. CO2 permeabilities up to 209 barrer and selectivities up to 241 were obtained. The comparison of these membranes with some of the most promising materials in the literature indicates that the ethanolamine-based ILs + PVA membranes have moderate CO2 permeabilities, associated with outstanding CO2/CH4 selectivities.
keywords
GAS-TRANSPORT PROPERTIES; MIXED MATRIX MEMBRANE; CARBON-DIOXIDE; STRUCTURAL-CHARACTERIZATION; FACILITATED TRANSPORT; SEPARATION MEMBRANE; CHOLINE CHLORIDE; CO-POLYIMIDES; HOLLOW-FIBER; POLYSULFONE
subject category
Engineering
authors
Alcantara, ML; Oliveira, GDR; Liao, LM; Ortiz, A; Mattedi, S
our authors
Murilo Leite Alcantara
Junior Researcheracknowledgements
The authors gratefully acknowledge the support from FAPESB (Project APP0075/2016), CAPES (Coordination for the Improvement of Higher Education Personnel)/Brazil (PDSE-88881.132805/2016-01), process no. 2021/07155-6, Research Support Foundation of the State of Sao Paulo (FAPESP) and, National Council for Scientific and Technological Development/Brazil (CNPq) (grant PQ-311342/2022-1 for S.M. and PQ-310051/2022-3 for L.M.L.). Grammarly and Chat GPT 4.0 tools were used herein to correct grammar and increase the readability of the original manuscript. The prompt used on chat GPT 4.0 was the following: "Correct the grammar and increase the readability of this academic manuscript. Do not perform any additional modification, nor add or modify any information on the original manuscript. Maintain the original meaning.''