Liquid−Liquid Equilibria and Partitioning of o-Chlorophenol in Ethylene Glycol Monobutyl Ether + Water, Diethylene Glycol Monohexyl Ether + Water, and Poly(oxyethylene(4)) Lauryl Ether + Water

Abstract

Liquid−liquid equilibria of ethylene glycol monobutyl ether (C4E1) + water and diethylene glycol monohexyl ether (C6E2) + water at atmospheric pressure were measured for temperature ranges of 322.8 K and 273.2 K to 382.5 K, respectively. The lower critical solution temperature (LCST) and upper critical solution temperature (UCST) of C4E1 + water were determined to be 322.8 K and 402.8 K, respectively. The LCST of C6E2 + water is 273.2 K, while the corresponding UCST does not exist. The equilibrium compositions of o-chlorophenol partitioning in the top and bottom phases of the three binary C4E1 + water, C6E2 + water, and poly(oxyethylene(4)) lauryl ether (C12E4) + water mixtures were also measured.

Mutual Solubility and Lower Critical Solution Temperature for Water + Glycol Ether Systems

“…Published data for the mutual solubility of the water + diethylene glycol n-hexyl ether system do not all agree. The data of Lee and Lee 12 and Chakhovsky 17 extend to a lower critical solution temperature at least 10°below the LCST reported by Lai and Chen, 18 Stephenson, 14 and Lim et al 19 In Figure 7, the data from this study are shown to agree well with the data of Lai and Chen, 18 which are also in good agreement with the mutual solubility data of Stephenson 14 and Lim et al 19 Data in the literature for the water + triethylene glycol n-hexyl ether system consist of two plots of the two-phase boundary with reported LCST's of 46.0 °C20 and 44.66 °C, 21 and mutual solubility data with a reported LCST of 44.09 °C. 18 Good agreement is shown in Figure 8 between the mutual solubility data of this study and that of Lai and Chen.…”

“…Tables −13 give the measured equilibrium compositions for the 11 water + ethylene glycol ether systems; these data are plotted in Figures −11. Several investigators have reported measurements of phase compositions for the water + ethylene glycol n -butyl ether system for at least a portion of the closed-loop liquid−liquid equilibrium phase diagram. − The mutual miscibility curves and the LCST and UCST are well established, with generally good agreement among researchers. Figure shows a comparison of the data of the present study with the data of Ellis, which are representative of the literature; excellent agreement is observed between the two data sets.…”

Surface Tension and Density of Ethylene Glycol Monobutyl Ether–Water Mixtures from 277.15 to 308.15 K

“…hphobic hphilic (7) where ln λ hphobic and ln λ hphilic are the hydrophobic (aliphatic chain) and hydrophilic contributions (ethylene oxide and a hydroxyl group). Group contribution values could be obtained by the correlation of γ ∞ with the hydrophobic and hydrophilic chain length for a specific homologous family, e.g., ethoxylated alcohols as C n E m , where n stands for the aliphatic chain length and m for the ethoxylated chain length.…”

“…Ethylene glycol monobutyl ether (EGBE) is a water-soluble organic solvent capable of solubilizing several organic compounds. The alcohol from which it is synthesized ( n -butanol) is partially soluble in water at room conditions, with an upper critical solubility temperature ( T = 403.1 K and a molar fraction of 0.1070). , The addition of an ethylene oxide (EO) molecule, as part of the hydrophilic region, dramatically changes its physical properties to a completely miscible solvent in water at room temperature and the phase diagram changes to a closed two-phase loop with an upper and lower critical solubility temperature (around 402.86 and 322.12 K for the upper and lower critical solution temperature, respectively). − EO provides an important surface activity, making EGBE one of the smallest surfactants. EGBE application scope covers several uses: as a component in fracturing and drilling fluids for the petroleum industry, , as an additive in ink, lacquers, varnishes, and enamels in the painting industry, , and as a cosurfactant in cleaning products, − among others.…”

Isobaric Vapor–Liquid Equilibria for the 1-Propanol + Ethylene Glycol Monopropyl Ether and 1-Butanol + Ethylene Glycol Monopropyl Ether Systems

“…In order to quantify the phase behavior we have performed isothermal VLE and isobaric VLE , experiments of nonionic surfactants and hydrocarbon mixture systems. However, in contrast to the abundance of phase equilibrium data for water + surfactant − measured at atmospheric pressure, few data have been collected for nonionic surfactant + hydrocarbon , and alcohol systems.…”