Modeling the liquid–liquid equilibrium for the recovery of carboxylic acids from aqueous solutions

Maurer, Gerd

doi:10.1016/j.fluid.2005.11.005

Cited by 31 publications

(9 citation statements)

References 36 publications

(50 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results fit well to the data from the literature. Maurer [27] describes the dimerization by intermolecular hydrogen bonding of acetic acid in low polar solvents. Table 1.…”

Section: Physical Extractionmentioning

confidence: 99%

Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane

2019

View full text Add to dashboard Cite

The present work develops the basics for the isolation of lactic acid, acetic acid and formic acid from a single as well as a mixed feed stream, as is present, for example, in fermentation broth for lactic acid production. Modelling of the phase equilibria data is performed using the law of mass action and shows that the acids are extracted according to their pka value, where formic acid is preferably extracted in comparison to lactic and acetic acid. Back-extraction was performed by 1 M NaHCO3 solution and shows the same tendency regarding the pka value. Based on lactic acid, the solvent phase composition, consisting of tri-n-octylamine/1-octanol/n-undecane, was optimized in terms of the distribution coefficient. The data clearly indicate that, compared to physical extraction, mass transfer can be massively enhanced by reactive extraction. With increasing tri-n-octylamine and 1-octanol concentration, the equilibrium constant increases. However, even when mass transfer increases, tri-n-octylamine concentrations above 40 wt%, lead to third phase formation, which needs to be prevented for technical application. The presented data are the basis for the transfer to liquid membrane permeation, which enables the handling of emulsion tending systems.

show abstract

“…These results fit well to the data from the literature. Maurer [27] describes the dimerization by intermolecular hydrogen bonding of acetic acid in low polar solvents. Table 1.…”

Section: Physical Extractionmentioning

confidence: 99%

Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane

2019

View full text Add to dashboard Cite

show abstract

“…These four component systems were thoroughly investigated theoretically and experimentally by the Maurer group [241][242][243][247][248][249]. Distribution of citric acid between both phases at 25 °C (molalities of tri-n-octylamine in organic phase are nearly equal) is presented in Fig.…”

Section: Two-phase Citric Acid-tertiary Amine-water Systemsmentioning

confidence: 99%

“…The factors such as the nature and initial concentration of diluent, pH, temperature, concentration range and coextraction of water change the form of extraction isotherms and such changes are attributed to differences in the stoichiometry of formed complexes. Similar procedures based on the chemical model (formation of complexes and dimers), were also applied to more complicated situations when citric acid is separated from small amounts of carboxylic acids which are always present in fermentation broths [232,235,241,249,253,255].…”

Section: Two-phase Citric Acid-tertiary Amine-water Systemsmentioning

confidence: 99%

Properties of Citric Acid and Its Solutions

Apelblat

2014

Citric Acid

View full text Add to dashboard Cite

“…It is intuitive that the type of liquid‐liquid equilibrium (LLE) system will be the dominant factor in controlling the phase equilibria. Procedurally, a quantitative knowledge of the solvent effect on the ternary LLE, the swing effect of a mixed solvent, the third phase formation, and temperature is critical to identifying optimum LLE conditions for the acid recovery. Especially, a quantitative characterization of the solvent effect in terms of the distribution coefficient, insolubility in water, selectivity, density, toxicity, and cost is substantial to the choice of more benign solvents and more appropriate equilibrium conditions for the acid recovery .…”

Section: Introductionmentioning

confidence: 99%

Estimation of liquid‐liquid equilibrium of type 2 systems (water + valeric acid + monobasic ester or dibasic ester or alcohol) using SERLAS, SERLAS‐modified, and SERLAS‐integrated

2017

View full text Add to dashboard Cite

This paper studies liquid‐liquid equilibrium (LLE) of the type 2 systems (water + valeric acid + dibasic ester or monobasic ester or alcohol) at T = (298.2 ± 0.1) K and p = (101.3 ± 0.7) kPa. Equilibrium distribution of valeric acid onto (water + solvent) two‐phase system is better for more structured diethyl sebacate and ethyl caprylate as compared to less structured diethyl succinate, diethyl malonate, ethyl valerate, and isoamyl alcohol. The two‐phase envelope size and the tie line slope on the phase diagrams are varying as follows: ethyl caprylate > diethyl sebacate > ethyl valerate > diethyl succinate ≈ diethyl malonate > isoamyl alcohol. The SERLAS‐integrated (solvation energy relation for liquid associated systems‐integrated) molecular model with nine physical descriptors, originated from LSER (linear solvation energy relation) principles in conjunction with group‐contribution method, is proposed and applied to the prediction of type 2 LLE properties. By combining SERLAS with UNIFAC‐Dortmund, we are able to get along with a simultaneous impact of both methods for satisfactorily simulating type 2 phase behaviour so long as solvent effects are concerned. SERLAS, SERLAS‐modified, SERLAS‐integrated, and UNIFAC‐original models have been stringently tested for consistency in reproducing phase equilibrium properties with average deviations inferior to 28.8 %, 44.3 %, 21.3 %, and 30.4 %, respectively.

show abstract

Modeling the liquid–liquid equilibrium for the recovery of carboxylic acids from aqueous solutions

Cited by 31 publications

References 36 publications

Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane

Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane

Properties of Citric Acid and Its Solutions

Estimation of liquid‐liquid equilibrium of type 2 systems (water + valeric acid + monobasic ester or dibasic ester or alcohol) using SERLAS, SERLAS‐modified, and SERLAS‐integrated

Contact Info

Product

Resources

About