Tetraalkylammonium oleate and linoleate based ionic liquids: promising extractants for metal salts

Selective Extraction of Metals from Chloride Solutions with the Tetraoctylphosphonium Oleate Ionic Liquid

“…These hydrophobic ILs have been applied for the extraction of several transition metals and showed excellent extraction efficiencies. 11 The bulky and hydrophobic cations prevent loss of the IL to the water phase. Another advantage of the fatty-acid-based…”

Applying electrohydrodynamic atomization to enhance mass transfer of metal salts from an aqueous phase towards ionic liquids

“…This is in agreement with previous research, in which it was already observed that the IL, [N 8888 ][C18:1], showed good extraction for Co and Mn, but low extraction for Ca and no extraction for Na when physical mixing is applied. 25,41 Applying EHDA resulted in an improvement of the selectivity towards the valuable transition metals. The separation factor of Co over Ca and Mn over Ca was respectively, 3.68 and 3.69 when applying physical mixing while during electrospraying at 5 kV a separation factor of respectively 5.00 and 4.84 was observed.…”

“…As reported in the literature such mechanism is based on ion-pair extraction. 25,41,42 Before using the IL, it was pre-saturated with water to decrease the viscosity and to facilitate electrospraying. The aqueous metal salt solution was prepared by dissolving 0. the experiments was synthesized using the same method as previously described and had a purity of…”

“…[25][26][27] Currently, metal salt extraction with ILs is carried out using a mixer-settler configuration. This means that mechanical mixing of the IL with the aqueous metal solution is performed to enhance the contact between the extract and the solution containing the contaminant.…”

Regeneration of the ionic liquid tetraoctylammonium oleate after metal extraction

“…[2][3][4][5][6] Recently, non-fluorinated fatty acid based ILs were synthesized in the search for biocompatible, non-toxic metal selective ILs. 7 Oleic acid and linoleic acid were selected as anion due to their affinity towards metals combined with the voluminous and hydrophobic tetraalkylammonium cations to prevent the loss of the IL to the water phase. These hydrophobic ILs have been applied for the extraction of several transition metals and rare earth metals and showed excellent extraction efficiencies.…”