Enhanced Extraction of Phenol from Model Oils Using Ionic Liquids Elucidated with Neutron Diffraction

Enhanced Extraction of Phenol from Model Oils Using Ionic Liquids Elucidated with Neutron Diffraction

Aromatic cation ionic liquids (ILs) based on alkylpyridiniums are shown to be good phenol extractants from model oils (hexane/toluene). ILs with hard basic anions are found to have best extraction efficiency consistent with tetraalkylammonium salts ([NR4]X). Key extraction interactions were analysed...

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Bibliographic Details
Main Authors: Turner, Adam H, Byrne, Emily L, Pereira, Thaise, Holbrey, John D
Format: text
Published: Archīum Ateneo 2020
Subjects:
Ionic Liquids
Extraction
Sustainable
Green
Liquid Structure
Neutron Diffraction
SANS
EPSR
Chemistry
Materials Chemistry
Online Access:https://archium.ateneo.edu/chemistry-faculty-pubs/161
https://pubs.rsc.org/en/content/articlelanding/2020/cp/d0cp01013h
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Institution: Ateneo De Manila University
Description
Summary:Aromatic cation ionic liquids (ILs) based on alkylpyridiniums are shown to be good phenol extractants from model oils (hexane/toluene). ILs with hard basic anions are found to have best extraction efficiency consistent with tetraalkylammonium salts ([NR4]X). Key extraction interactions were analysed using small angle neutron diffraction. Trifluoromethanesulfonate ([OTf]- or triflate) anions provide the synergistic effects of reduced cation-phenol centre of mass (COM) distances and increased hydrogen bonding that are linked to the improved extraction efficiency of these hard basic anions. Increases in cation electron density (methyl-pyridinium ([Me-Py]+) vs methyl-picolinium ([Me-3-Pic]+)) also reduce cation-phenol COM interaction lengths consistent with small increases in extraction efficiency for the same ionic liquids.

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