Impact of α-d-glucose pentaacetate on the selective separation of CO₂ and SO₂ in supported ionic liquid membranes
2012
Hu, Xing-Bang | Li, Ya-Xin | Huang, Kuan | Ma, Shao-Ling | Yu, Hong | Wu, You-Ting | Zhang, Zhi-Bing
A biocompatible, nontoxic, and nonvolatile compound, α-d-glucose pentaacetate (GPA), was impregnated in supported ionic liquid membranes (SILMs) and used for the selective separation of CO₂ and SO₂. It was found that GPA could cooperate with [Bmim][BF₄] to influence the permeability of CO₂ and enhance the CO₂/N₂ selectivity. Further permeation experiments demonstrated that the addition of GPA could reduce the permeability of N₂ in the SILMs and thereby improve the CO₂/N₂ and SO₂/N₂ selectivities. The highest CO₂/N₂ selectivity obtained in the paper is 79 ± 0.9 for dry gas and 86 ± 1.6 for humidified gas, and the highest SO₂/N₂ selectivity is 686 ± 19.8 for dry gas. This environmentally benign separation process with high gas permeability and good selectivity may be expected to have a potential application for the separation of CO₂ and SO₂ from a flue gas stream.
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