Phase Equilibrium of Water + Formic Acid + Acetic Acid + Solvent (Amyl Acetate or Diisobutyl Ketone or Diisopropyl Ether) Quaternary Liquid Systems

Abstract

Liquid-liquid equilibrium data of water + formic acid + acetic acid + solvent (amyl acetate, diisobutyl ketone, and diisopropyl ether) quaternary systems were measured at 298.15 K and atmospheric pressure. Complete phase diagrams were obtained by determining solubility curves and tie-lines. A comparison of the extracting capabilities of the solvents was made with respect to distribution coefficients, separation factors, and solvent-free selectivity bases. Reliability of the data was ascertained from Othmer-Tobias plots. The tie-lines were also predicted using the UNIFAC model. It is concluded that the used solvents can be treated as suitable separating agents for dilute aqueous formic and acetic acid mixtures.

Comparative Study of Liquid–Liquid Phase Equilibria of the Type II Systems Water + Carboxylic Acids (C5 and C6) + Acetate Esters: Measurement and Correlation

“…Within the uncertainty of both experimental and literature sets, except for water in caproic acid, the measured mutual binary values are relatively in good agreement with the reported data, ,− ,,,,− suggesting the reliability of the cloud point method.…”

Liquid–Liquid Equilibria Data for the Quaternary System of Acetic Acid, Water, p-Xylene, and Ethyl Acetate at 313.15 K and 101.325 kPa

“…The use of p -xylene as a solvent is proposed because of its special application as the main reactant in the industrial production of terephtalic acid. In addition, ethyl acetate is used because this solvent is good for acetic acid extraction. , Several experimental studies of LLE ternary systems containing acetic acid have been published. − Furthermore, there are several papers on LLE quaternary systems containing acetic acid and water. − To extract acetic acid from water, Cehreli and Bilgin examined those components combined with propionic acid and mixed solvent. Bilgin further studied this by combining propionic acid with another mixed solvent.…”

“…The aim of this study was to obtain LLE data for the industrial design and process simulation of acetic acid extraction using the mixed solvent of ethyl acetate and p-xylene at 313. 15 column originally comes from the top product of the distillation column in the upstream process, and its temperature maintains at 313.15 K to avoid the possible crystallization of acetic acid during the process. The experimental results for the composition of the coexisting phases of a series of quaternary mixtures of the components were obtained.…”

Liquid Phase Equilibria of Water + Formic Acid + Dimethyl Carbonate Ternary System at Several Temperatures

“…So as to cut down on the cost, extraction can be an alternative method . The extraction equilibria of formic acid have been investigated by several researchers. − …”