Separation of ionic liquids from dilute aqueous solutions using the method based on CO sub(2) hydrates

Ionic liquids (ILs) have been regarded as the potential novel solvents for improved analytical- and process-scale separation methods. The development of methods for the recovery of ILs from aqueous solutions to escape contamination and recycle samples will ultimately govern the viability of ILs in t...

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Bibliographic Details
Published in:Journal of natural gas chemistry 2010-01, Vol.19 (1), p.81-8581-85
Main Authors: Peng, Xiaoming, Hu, Yufeng, Liu, Yansheng, Jin, Chuanwei, Lin, Huaijing
Format: Article
Language:English
Subjects:
Aqueous solutions
Carbon dioxide
Dilution
Hydrates
Ionic liquids
Natural gas
Purification
Separation
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Summary:Ionic liquids (ILs) have been regarded as the potential novel solvents for improved analytical- and process-scale separation methods. The development of methods for the recovery of ILs from aqueous solutions to escape contamination and recycle samples will ultimately govern the viability of ILs in the future industrial applications. Therefore, in this paper a new method for separation of ILs from their dilute aqueous solutions and simultaneously purification of water was proposed on the basis of the CO sub(2) hydrate formation. For illustration, the dilute aqueous solutions with concentrations of ILs ranging from 2 x 10 super(-3) mol% to 2 x 10 super(-1) mol% were concentrated. The results show that the separation efficiency is very impressive and that the new method is applicable to aqueous solutions of both hydrophobic and hydrophilic ILs. Compared to the literature separation method based on the supercritical CO sub(2), the new method is applicable to lower concentrations, and more importantly, its operation condition is mild.
ISSN:1003-9953
DOI:10.1016/S1003-9953(09)60027-X