Supported protic ionic liquid membrane based on 3-(trimethoxysilyl)propan-1-aminium acetate for the highly selective separation of CO 2

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Journal of Membrane Science, ISSN: 0376-7388, Vol: 543, Page: 301-309

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Ayesha Ilyas; Nawshad Muhammad; Mazhar Amjad Gilani; Khurshid Ayub; Ivo F.J. Vankelecom; Asim Laeeq Khan
Elsevier BV
Biochemistry, Genetics and Molecular Biology; Materials Science; Chemistry; Chemical Engineering
article description
The ability to tailor ionic liquids can result in very high separation efficiency for CO 2 /CH 4 and CO 2 /N 2. In this study, a new protic ionic liquid was synthesized with high CO 2 absorption capacity employing (3-aminopropyl) trimethoxysilane and acetic acid, both of these have been reported to exhibit high affinity for CO 2. The synthesized ionic liquid was characterized by FTIR and the supported ionic liquid membrane was tested to determine the separation of CO 2 from CH 4. Experiments were conducted at different temperatures and feed conditions, and pure and mixed gas permeability/selectivity data were reported. This combination of silyl ether functionalized cation and acetate ion dramatically improved the membrane separation performance as the SILM displayed CO 2 permeance of 23 GPU combined with CO 2 /CH 4 selectivity of 41. The synthesized SILM was stable upto 10 bar as no leaching of ionic liquid was observed and the permeance increased from 23 to 31 GPU as the temperature was raised from 25 °C to 65 °C, while the selectivity slightly decreased from 41 to 35 over the same temperature range. The exceptionally high selectivity of CO 2 /CH 4 makes [APTMS][Ac] a promising room temperature ionic liquid for CO 2 separation without facilitated transport. A synergistic effect of methoxy groups from [APTMS] part of the ionic liquid caused the enhanced permeability of CO 2 as supported by theoretical calculations.