Phase equilibria in binary mixtures with monoethyl succinate (original) (raw)
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Liquid–liquid equilibria of the ternary system water+acetic acid+dimethyl succinate
Fluid Phase Equilibria, 2005
Liquid–liquid equilibrium (LLE) data of water+acetic acid+dimethyl succinate were measured at 298.2, 308.2, and 318.2K. Complete phase diagrams were obtained by determining binodal curves and tie lines. The reliability of the experimental tie line data was confirmed by using the Othmer–Tobias correlation. The UNIFAC and modified UNIFAC model were used to predict the phase equilibrium data in the ternary system. Distribution coefficients and separation factors were evaluated for the immiscibility region.
Solubility and solute–solvent interaction phenomenon of succinic acid in aqueous ethanol mixtures
Journal of Molecular Liquids, 2017
In this article solubility of succinic acid (SA) were measured by the gravimetric method in pure water and in different composition of binary mixtures of water and ethanol solvents mixtures at 288.15 K to 308.15 K. The solubility data were taken for estimating the standard transfer Gibbs t ) of transfer of succinic acid have been computed by subtracting the cavity effects and dipole-dipole interaction effects from the total transfer energies. The solubility data and other physicochemical properties of succinic acid in aqueous-ethanol solvent mixtures are essential for biochemistry, particularly in the food, cosmetic, pharmaceutical sciences, industrial design and further theoretical studies. Therefore the characteristics of the solvation thermodynamics of succinic acid in aqueous-ethanol mixed solvent systems were discussed in this article.
Journal of Chemical and Engineering Data, 2007
Liquid + liquid) equilibrium (LLE) data for the solubility curves and tie-line compositions were examined for mixtures of {water (1) + propionic acid (2) + dimethyl succinate or dimethyl glutarate or dimethyl adipate (3)} at T = 298.15 K and atmospheric pressure, (101.3 ± 0.7) kPa. The relative mutual solubility of the propionic acid is higher in the dibasic esters phases than in the aqueous phase. The reliability of the experimental tie-line data were confirmed by using the Othmer-Tobias correlation. The LLE data of the ternary systems were predicted by UNIFAC and modified UNIFAC methods. Distribution coefficients and separation factors were evaluated for the immiscibility region.
The Journal of Chemical Thermodynamics, 2016
Density, viscosity and refractive index of binary mixtures consisting of diethyl succinate + 1-propanol, or +1-butanol, or +1-hexanol have been measured at atmospheric pressure and over the temperature range from 288.15 K to 323.15 K. Excess and deviation functions have been calculated from these data and fitted to the Redlich-Kister equation. The values of excess molar volume and deviation functions, with Fourier transform infrared (FT-IR) spectroscopy, were further used in the analysis of molecular interactions present in the mixture as well as the temperature influence on them.
Fuel and Energy Abstracts, 2011
Liquid-liquid equilibrium (LLE) data of the solubility (binodal) curves and tie-line end compositions were examined for mixtures of {(water (1) + butyric acid (2) + diethyl succinate or diethyl glutarate or diethyl adipate (3)} at 298.2 K and 101.3 ± 0.7 kPa. The relative mutual solubility of butyric acid is higher in the diethyl succinate or diethyl glutarate or diethyl adipate layers than water layers. The consistency of the experimental tie-lines was determined through the Othmer-Tobias correlation equation. The LLE data were correlated with NRTL model, indicating the reliability of the NRTL equations for these ternary systems. The best results were achieved with the NRTL equation, using non-randomness parameter (˛= 0.3) for the correlation. Distribution coefficients and separation factors were measured to evaluate the extracting capability of the solvents.
Atmospheric Research, 2006
A method for determining evaporation rates and thermodynamic properties of aqueous solution droplets is introduced. The method combines evaporation rate measurements using modified TDMA technique with data evaluation using an accurate evaporation model. The first set of data has been collected and evaluated for succinic acid aqueous solution droplets.Evaporation rates of succinic acid solution droplets have been measured using a TDMA system at controlled relative humidity (65%) and temperature (298 K). A temperature-dependent expression for the saturation vapour pressure of pure liquid phase succinic acid at atmospheric temperatures has been derived by analysing the evaporation rate data with a numerical model. The obtained saturation vapour pressure of liquid phase succinic acid is ln(p) = 118.41 − 16204.8/T − 12.452ln(T). The vapour pressure is in unit of Pascal and the temperature in Kelvin. A linear expression for the enthalpy of vaporization for liquid state succinic acid is also presented.According to the results presented in the following, a literature expression for the vapour pressure of liquid phase succinic acid defined for temperatures higher than 461 K [Yaws, C.L., 2003. Yaws' Handbook of Thermodynamic and Physical Properties of Chemical Compounds, Knovel] can be extrapolated to atmospheric temperatures with very good accuracy. The results also suggest that at 298 K the mass accommodation coefficient of succinic acid is unity or very close to unity.
Solubility of succinic acid in pure solvents and in mixed solvents as a function of temperature
Data corresponding solid-liquid equilibrium (SLE) of succinic acid in pure water, different aqueous solvent mixtures containing water + dimethylformamide (DMF) and pure DMF were measured with temperature range from 303.15K to 323.15K under atmospheric pressure by employing gravimetric method. The experimental results indicated that the solubility of succinic acid in aqueous solvent mixture increase with increasing both temperature and mass fraction of organic solvents. The experimental data were well-correlated with the rational models to accounted the nonideality of the systems
Journal of Chemical Thermodynamics, 2007
Liquid + liquid) equilibrium (LLE) data for the solubility curves and tie-line compositions were examined for mixtures of {water (1) + propionic acid (2) + dimethyl succinate or dimethyl glutarate or dimethyl adipate (3)} at T = 298.15 K and atmospheric pressure, (101.3 ± 0.7) kPa. The relative mutual solubility of the propionic acid is higher in the dibasic esters phases than in the aqueous phase. The reliability of the experimental tie-line data were confirmed by using the Othmer-Tobias correlation. The LLE data of the ternary systems were predicted by UNIFAC and modified UNIFAC methods. Distribution coefficients and separation factors were evaluated for the immiscibility region.
Diethyl succinate synthesis by reactive distillation
Separation and Purification Technology, 2012
Diethyl succinate is continuously produced from succinic acid and ethanol in a 6-m tall, elevated pressure reactive distillation column. Esterification is carried out in excess ethanol such that water and ethanol are produced in the distillate and diethyl succinate is produced in the bottoms stream. The reaction is catalyzed by Amberlyst 70 cation exchange resin contained in KATAPAK SP-11 Ò structured packing within the stainless steel column. Succinic acid conversions approaching 100%, and diethyl succinate yields of up to 98% have been experimentally achieved in the lab scale column. The esterification process has been simulated using the Radfrac module in Aspen Plus Ò . Simulations used reaction kinetic and phase equilibrium data collected in our laboratory to predict the steady state stream compositions from the column. Good agreement between experimental and simulation results was observed, thus facilitating the use of the model for design and scale up of the reactive distillation process.