Liquid−Liquid Extraction of Linalool from Methyl Eugenol with 1-Ethyl-3-methylimidazolium Hydrogen Sulfate [EMIM][HSO4] Ionic Liquid

Tuğba Erkoç,Lutfullah M Sevgili,Selva Çavuş

doi:10.1515/chem-2019-0067

Tuğba Erkoç, Lutfullah M Sevgili + Show 1 more

Open Access

https://doi.org/10.1515/chem-2019-0067

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Journal: Open Chemistry	Publication Date: Aug 24, 2019
Citations: 3	License type: CC BY 4.0

Affiliation: Istanbul University

Abstract

AbstractThe liquid–liquid equilibrium (LLE) data for a ternary system {methyl eugenol + linalool +1-ethyl-3-methylimidazolium hydrogen sulfate [EMIM][HSO4]} (Meu-Lin-IL) were measured at 298.2 K and atmospheric pressure. The Othmer–Tobias correlation was used to verify the reliability of the experimental tie-line data. The solubility curves were obtained using the cloud point titration indicating the liquid-liquid equilibrium of the ternary system was in Type II class where two immiscible curve pairs were attained. Distribution coefficients, separation factors and selectivity were calculated for the immiscibility regions. The calculated results were compared with the experimental data. Characterization studies were performed by Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA) and proton nuclear magnetic resonance spectroscopy (1H-NMR) techniques.

Highlights

Ionic liquids (ILs), green solvents, are environmentally friendly solvents [1] and they have gained considerable importance in recent years because of their superior properties such as non-volatility [1, 2], solubility in a broad range of compounds and excellent thermal and chemical stability [2]
To the best of our knowledge, there is no report on the separation of methyl eugenol + linalool essential oil components except a study where kinetic and diffusion parameters were investigated for solvents and for methyl eugenol + linalool mixtures using synthesized copolymers of poly(dodecyl methacrylate-co-methyl eugenol) and poly(dodecyl methacrylate-co-methyl chavicol) gels [19]
The present study focused on the use of 1-ethyl-3-methylimidazolium hydrogen sulfate [EMIM][HSO4] as an ionic liquid for the liquid-liquid extraction of linalool from methyl eugenol + linalool mixture

Summary

Introduction

Ionic liquids (ILs), green solvents, are environmentally friendly solvents [1] and they have gained considerable importance in recent years because of their superior properties such as non-volatility [1, 2], solubility in a broad range of compounds and excellent thermal and chemical stability [2]. Gonçalves et al [17] studied LLE of limonene-linaloolalcoholic solvents They used ethanol with different water content and found that the increase of water content in ethanol caused a decrease in the extraction of oxygenated components (i.e., linalool). Lago et al [18] investigated LLE ternary system of three 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ionic liquids (with ethyl-, hexyl-, or decyl- alkyl groups) formed by essential oils (limonene and linalool) at 298.15 K. They [18] stated that all three systems show a Type II behavior. The present study focused on the use of 1-ethyl-3-methylimidazolium hydrogen sulfate [EMIM][HSO4] as an ionic liquid for the liquid-liquid extraction of linalool from methyl eugenol + linalool mixture. The obtained equilibrium data are in Type II class which is found rarely in literature [18, 22,23,24]

Experimental

Results and Discussion

Conclusion