Pyrrolidinium and morpholinium ionic liquids as a novel effective destabilising agent of mineral suspension
2018
Bastrzyk, Anna | Feder-Kubis, Joanna
Here we describe ionic liquids (ILs) with an octyloxymethyl substituent in the cation designed and prepared using cheap and reactive cyclic tertiary amine: 1-methylpyrrolidine and 4-methylmorpholine. The synthesis rout was described, especially Menschutkin reaction. The physicochemical characteristics of the obtained pyrrolidinium and morpholinium chlorides were examined. The effect of the type of the amine present in the cation on the physicochemical properties of ionic liquids was determined. Next, the effect of these molecules on the stability of a quartz suspension was investigated. We found that an increase in the concentration of ILs in the suspension resulted in increased Turbiscan Stability Index (TSI) values by up to 64.7 and 65.9 for pyrrolidinium and morpholinium salts, respectively. The observed strong coagulation was a result of changes in the mineral surface properties due to the adsorption of the molecules. The ionic liquids molecules present at the quartz surface led to a more hydrophobic surface and changed the zeta potential value from −58.3 to −1.0 and 0.3 mV for pyrrolidinium chloride and morpholinium chloride, respectively. Our data show that these ionic liquid molecules could be used as effective, eco-friendly destabilising agents in the mineral industry.
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