Extraction of free fatty acids from soybean oil using ionic liquids or poly(ethyleneglycol)s

Abstract

The alternative solvents poly(ethyleneglycol)s (PEGs) with various molar masses and room temperature ionic liquids (RTILs) AMMOENG100 and 1-butyl-3-methylimidazolium dicyanamide (bmimDCA) were studied for the purpose of extraction of linoleic acid from soybean oil. Liquid-liquid phase equilibrium was measured for binary (PEG þ soybean oil), (RTIL þ soybean oil) as well as ternary (PEG þ soybean oil þ linoleic acid), (RTIL þ soybean oil þ linoleic acid) mixtures, as a function of temperature and composition. The influence on distribution coefficients and separation factor of temperature, initial acid content of the oil and solvent to oil ratio were studied. The effect of molar mass in the case of the PEGs was also examined. The experimental results were modeled using the Peng-Robinson cubic equation of state coupled with the Mathias-Klotz-Prausnitz mixing rule, with good results.

Densities, viscosities, and refractive indices of the binary systems (PEG200+1,2-propanediol, +1,3-propanediol) and (PEG400+1,2-propanediol, +1,3-propanediol) at (288.15 to 333.15)K and atmospheric pressure: Measurements and modeling

“…Critical parameters of pure components [50,51] used in the equation of state modeling are given in table A1, Appendix A. Parameters in all mixing rules, used as temperature independent (correlation performed at each temperature), are as follows: k ij,1 , m ij,1 for vdW1-2, k ij,1 , l ij,1 , m ij,1 for vdW1-3, Dg 12,1 , Dg 21,1 for TCBT-2 and k ij,1 , Dg 12,1 , Dg 21,1 for TCBT-3. Details about the models used in this work can be found in our previous papers [52][53][54][55][56].…”

The essential role of hydrogen‐bonding interaction in the extractive separation of phenolic compounds by ionic liquid

“…Ionic liquids (ILs) have attracted great attention as alternative extractants in liquid-liquid extraction in recent years, because of their unique properties such as structural and functional tunability, ultralow volatility, and low mutual solubility with water or weak-polar solvents. [1][2][3][4][5] Especially, ILs have shown notable efficiency on the extractive separation of phenolic compounds, which are one major class of the industrial chemicals and pollutants and are the most abundant bioactive compounds whose contents in biomass are only lower than cellulose, hemicellulose, and lignin. 6,7 ILs could selectively extract phenols from water or esters with elevated efficiency than common extractants.…”

Excess molar volumes and viscosity behaviour of binary mixtures of aniline/or N,N-dimethylaniline with imidazolium ionic liquids having triflate or bistriflamide anion

“…They possess two main characteristics that qualify them as promising alternatives to classical (toxic) solvents: i) negligible vapour pressures in a wide temperature range [2,3] thus providing low atmospheric pollution and ii) diverse solvent power -they dissolve well a number of both polar and non-polar solutes, as it was reported [4] and reviewed in literature [5,6]. Therefore, ionic liquids found their applications as separation/extraction solvents for diverse solutes: for amino acids separation and purification [7][8][9], carbohydrate separation [10], for extraction of proteins [11], phenols [12], azo dyes [13], or for removal of free fatty acids [14].…”