Performance of functionalized ionic liquid with double chemical sites for separating phenolic compounds: mechanism and liquid-liquid behavior studies.
In: Journal of Environmental Chemical Engineering, Jg. 9 (2021-12-01), Heft 6, S. N.PAG
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Zugriff:
Ionic liquids (ILs) are recognized as green solvents in separation field. Many studies have found that the hydrogen bond between anions and solutes plays an important role during the separation process, while the cations in ILs do not. In this work, a functionalized [OHEmim][NO 3 ], 1-hydroxyethyl-3-methylimidazole nitrate, with double chemical sites, is designed for the separation of phenolic compounds (phenol, o -, m -, p -cresol). The hydroxyl group is introduced into the cation as a chemical site. Meanwhile, the anion is also a chemical site. Thus, both the anion and the cation can interact with phenolic compounds. To verify this view, the separation performance of the IL was evaluated by mechanism analysis and liquid-liquid equilibrium behavior. Then, the σ -profiles, bond length, and interaction energy between [OHEmim][NO 3 ] and phenolic compounds are calculated and compared with [Emim][NO 3 ]. The liquid-liquid equilibrium (LLE) data of n -hexane + (phenol, o -, m -, p -cresol) + [OHEmim][NO 3 ] ternary systems were determined. The separation coefficient (S) and distribution coefficient (D) were calculated to evaluate the extraction performance. Non-random two liquid (NRTL) model was adopted to correlate the experimental data, which can provide basic data and parameters for the extraction process design. [Display omitted] • [OHEmim][NO 3 ] with dual chemical sites is used to separate phenolic compounds. • The extraction performance was evaluated by mechanism and liquid-liquid behavior. • The separation ability of [OHEmim][NO 3 ] is enhanced by the introduction of -OH. [ABSTRACT FROM AUTHOR]
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Titel: |
Performance of functionalized ionic liquid with double chemical sites for separating phenolic compounds: mechanism and liquid-liquid behavior studies.
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Autor/in / Beteiligte Person: | Zhu, Chen ; Li, Fangfang ; Zhang, Jun ; Zhang, Lianzheng ; Gao, Jun ; Ma, Yixin ; Xu, Dongmei ; Wang, Yinglong |
Zeitschrift: | Journal of Environmental Chemical Engineering, Jg. 9 (2021-12-01), Heft 6, S. N.PAG |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 2213-3437 (print) |
DOI: | 10.1016/j.jece.2021.106790 |
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