Organic Salt Effect of Tetramethylammonium Bicarbonate on the Vapor–Liquid Equilibrium of the Dimethyl Carbonate + Methanol System

Abstract

Isobaric vaporÀliquid equilibrium (VLE) data for the systems dimethyl carbonate (DMC) + methanol and DMC + methanol + tetramethylammonium bicarbonate (TMAB) at different salt mole fractions (0.04, 0.07, and 0.10) have been measured at 101.32 kPa. The bubble-point data of the system methanol + TMAB have also been measured at different salt mole fractions. The addition of the organic salt TMAB has a salting-out effect on DMC, and the effect would be enhanced with the increasing salt concentration. The VLE data of the salt-containing system were predicted by the modified Wilson and nonrandom two-liquid (NRTL) models proposed by Tan. The average deviations for the mole fraction of the vapor phase and the bubble point by the modified predictive model were: Δy = 0.011, ΔT = 0.6 K.

Thermodynamic gE Models and Equations of State for Electrolytes in a Water-Poor Medium: A Review

“…is by far too large for a complete experimental study. To date, only a few data exist on salt solubility in nonaqueous media, most frequently in acetone and short-chain alcohols, , and even less frequently ternary and quaternary mixtures have been considered. ,, …”

“…To date, only a few data exist on salt solubility in nonaqueous media, most frequently in acetone and short-chain alcohols, 18,19 and even less frequently ternary and quaternary mixtures have been considered. 18,20,21 The experimental properties (e.g., density, viscosity, solubility, vapor-pressure depression, mean ionic activity coefficients MIAC, etc.) depend on temperature and pressure.…”

Measurement of (vapor+liquid) equilibrium for the systems {methanol+dimethyl carbonate} and {methanol+dimethyl carbonate+tetramethylammonium bicarbonate} at p=(34.43, 67.74)kPa

“…As the organic salt TMAB can influence the volatilities of methanol and DMC, while there is a difference in the interactions of the two liquid with salt ions, and the relative volatility will be changed, too. According to the [11]; ., at 66.66 kPa [11]; e, at 66.66 kPa [12]; 4, this work at 67.74 kPa; J, at 101.32 kPa [18]; I, at 101.30 kPa [8]; and s, at 102.73 kPa [10]. experiment results, the relative volatility of methanol and DMC decreases with TMAB added in at the reduced pressures, and that led the decrease of the azeotrope.…”

“…In each experiment, equilibrium was assumed when constant temperature and pressure had obtained for 30 min or more. The equilibrium temperature was measured with a precision mercury thermometer whose uncertainty was 0.05 K. The reliability of the experimental system has been tested in our previous work [17][18][19].…”

Intricate kinetics: in situ FTIR-spectroscopy discloses a phase change during ionic liquid synthesis

“…3). As the vapour pressure of DMC depends strongly on the concentration of organic salts, 15 and as the NEt 3 concentration is computed less accurately from the raw measurement data, these concentration profiles are not regarded to derive the reaction rate. The progress of r is split into an increasing section and a decreasing section which are separated by a non-differentiable point as the maximal rate is reached.…”