Liquid–Liquid Equilibrium Data for Ternary Systems Containing Alkanes (n-Pentane, n-Hexane, n-Heptane, and n-Octane) + Alcohol (Methanol and Ethanol) + Protic Ionic Liquid (2-HEAF)

Abstract

Azeotropic mixtures can occur in alcohol and alkane systems because of their close boiling points and highly nonideal molecular force interactions, leading to vapor–liquid coexistence envelopes with a maximum pressure. For this reason, it could be interesting from an academic and industrial viewpoint to find the appropriate solvents for separation processes involving azeotropic mixtures. Protic ionic liquids (PILs) are presented as an interesting alternative. This work reports liquid–liquid equilibrium data for ternary systems of alkanes (n-pentane, n-hexane, n-heptane, or n-octane) + alcohol (methanol or ethanol) + PIL 2-hydroxyethanolamine formate (2-HEAF) at 298.15 K and atmospheric pressure (101.3 kPa). Distribution coefficient (D) and selectivity parameter (S) data were used to evaluate the extracting potential of ionic liquids in separating alcohol from alkanes. Tie-line data were correlated with the nonrandom two liquid (NRTL) activity coefficient model, presenting a mean global deviation error of 0.9818%.

Ternary Liquid-Phase Equilibria of an Azeotropic Mixture (Heptane + Isopropyl Alcohol) with Deep Eutectic Solvents

“…Density and refractive index measurements were used to check the purity of the substances with a close agreement between the measured and literature data. − As can be seen from Table , the obtained experimental physicochemical data lie within the range of the literature values. The observed differences between the measured and reported data fall inside the expected uncertainties of both measured and reported values.…”

“…A variety of hydrocarbon–alcohol azeotropic mixtures are present in various industrial processes. Thus, the separation process of azeotropic systems such as a heptane–alcohol mixture is an important subject and needs further investigation. − As azeotropic mixtures cannot be separated by simple distillation, the separation of these mixtures is an important and demanding task in industrial processes . Therefore, selecting suitable solvents for the extraction of azeotropic systems is an important issue in scientific and technological development.…”

Liquid–Liquid Equilibria for Binary Azeotrope Mixtures of Heptane and Amyl Alcohols Using Different Choline Chloride Based Deep Eutectic Solvents at 298.15 K

“…Due to the hygroscopic nature of choline chloride, it was dried under vacuum oven over silica gel to eliminate any possible moisture for 48 h and then stored in a desiccator under nitrogen atmosphere before use. The purity of the chemicals was checked by comparing the measured values of density and refractive index with those reported in the literature. − The obtained measured data lie within the range of the reported values as listed in Table . The small deviations between the measured and reported data may have several sources such as exactitude of apparatus and measurements, precision of calibration, chemical purity, and moisture.…”

“…Several azeotropic mixtures of alcohol–alkane form nonideal mixtures are present in many industrial processes. Separation process of nonideal hydrocarbon–alcohol, particularly, heptane–alcohol systems especially azeotropic mixtures can be a serious and important issue merit discussing. − For the separation of alcohols from the hydrocarbons, liquid–liquid extraction is an effective process, which has special economically importance. The phase behavior and liquid–liquid equilibrium experiments containing alcohol–hydrocarbon have been satisfactorily performed by several authors.…”

Study of Methanol Extraction from Saturated Alkanes: Solvent Screening, Liquid–Liquid Equilibrium Measurement, and Thermodynamic Simulation

“…UNIQUAC Structural Parameters (r and q) for Pure Components NTf 2 ] 298.2 K;49 and (cyan triangle left-pointing solid) n-heptane + 2-HEAF 298.2 K 28. compared with those in the literature, and the relevant data are plotted in Figures4 and 5.…”