TY - JOUR
T1 - Benzyl-functionalized room temperature ionic liquids for CO 2/N 2 separation
AU - Mahurin, Shannon M.
AU - Dai, Thomas
AU - Yeary, Joshua S.
AU - Luo, Huimin
AU - Dai, Sheng
PY - 2011/12/21
Y1 - 2011/12/21
N2 - In this work, three classes of room temperature ionic liquids (RTILs), including imidazolium, pyridinium, and pyrrolidinium ionic liquids with a benzyl group appended to the cation, were synthesized and tested for their performance in separating CO 2 and N 2. All RTILs contained the bis(trifluoromethylsulfonyl)imide anion, permitting us to distinguish the impact of the benzyl moiety attached to the cation on gas separation performance. In general, the attachment of the benzyl group increased the viscosity of the ionic liquid compared with the unfunctionalized analogs and decreased the CO 2 permeability. However, all of the benzyl-modified ionic liquids exhibited enhanced CO 2/N 2 selectivities compared with alkyl-based ionic liquids, with values ranging from 22.0 to 33.1. In addition, CO 2 solubilities in the form of Henrys constants were also measured and compared with unfunctionalized analogs. Results of the membrane performance tests and CO 2 solubility measurements demonstrate that the benzyl-functionalized RTILs have significant potential for use in the separation of carbon dioxide from combustion products.
AB - In this work, three classes of room temperature ionic liquids (RTILs), including imidazolium, pyridinium, and pyrrolidinium ionic liquids with a benzyl group appended to the cation, were synthesized and tested for their performance in separating CO 2 and N 2. All RTILs contained the bis(trifluoromethylsulfonyl)imide anion, permitting us to distinguish the impact of the benzyl moiety attached to the cation on gas separation performance. In general, the attachment of the benzyl group increased the viscosity of the ionic liquid compared with the unfunctionalized analogs and decreased the CO 2 permeability. However, all of the benzyl-modified ionic liquids exhibited enhanced CO 2/N 2 selectivities compared with alkyl-based ionic liquids, with values ranging from 22.0 to 33.1. In addition, CO 2 solubilities in the form of Henrys constants were also measured and compared with unfunctionalized analogs. Results of the membrane performance tests and CO 2 solubility measurements demonstrate that the benzyl-functionalized RTILs have significant potential for use in the separation of carbon dioxide from combustion products.
UR - http://www.scopus.com/inward/record.url?scp=83655192542&partnerID=8YFLogxK
U2 - 10.1021/ie201428k
DO - 10.1021/ie201428k
M3 - Article
AN - SCOPUS:83655192542
SN - 0888-5885
VL - 50
SP - 14061
EP - 14069
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 24
ER -
