Partition data of propionic and butyric acids between aqueous NaCl solutions and cyclohexane

Al-Modhaf, H.F.; Hegazi, Mohamed F.; Amer, Sawsan M.; Abu-Shady, Abdel-Sattar I.

doi:10.1016/s1383-5866(01)00135-6

Cited by 7 publications

(11 citation statements)

References 6 publications

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“…As a result the distribution ratio increases when the concentration of NaCl in the aqueous phase increases significantly with the extraction efficiency increasing from: 4.67 to 8.43% for formic acid; 10.19 to 15.13% for acetic acid, and 8.62 to 18.55% for propionic acid, whereas the addition of NaCl has no influence on the stripping efficiency. This was earlier observed by Al‐Mudhaf and colleagues 9, 10, 19…”

Section: Resultssupporting

confidence: 80%

“…The effect of NaCl addition on the extraction efficiency is shown in Table 4. The addition of salt produces two effects: (1) it enhances the transfer of carboxylic acid from the aqueous phase (salting‐out effect), and (2) it lowers both the water content in the extracting phase and the organic solvent content in the raffinate phase 9, 10, 19. As a result the distribution ratio increases when the concentration of NaCl in the aqueous phase increases significantly with the extraction efficiency increasing from: 4.67 to 8.43% for formic acid; 10.19 to 15.13% for acetic acid, and 8.62 to 18.55% for propionic acid, whereas the addition of NaCl has no influence on the stripping efficiency.…”

Section: Resultsmentioning

confidence: 99%

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Recovery of carboxylic acids C₁C₃ with organophosphine oxide solvating extractants

Wiśniewski

Pierzchalska

2005

J of Chemical Tech & Biotech

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This study was aimed at examining the use of the organophosphine oxides Cyanex  921 and Cyanex  923 for the extraction of formic, acetic and propionic acids from aqueous solutions. The stripping of monocarboxylic acids with water from the loaded extractants was also examined. The studies were aimed at determining the equilibrium conditions for extraction and stripping. Overall, the effect of the kind of extractant was not significant although Cyanex  921 extracted carboxylic acids slightly better than Cyanex  923 with 1:1 complexes being formed by both extractants with the acids during extraction. The efficiency of extraction depended on temperature, acid concentration and solvent, with toluene a better diluent for the extractants than octane or Exxsol  D 220/230. Extraction efficiency increased as the concentration of acid in the feed decreased and, also, as the temperature increased, the amount of acid extracted decreased. The extraction and stripping isotherms were determined. The apparent enthalpy and entropy of the extraction reaction were determined. Distribution data for the transfer of carboxylic acids from aqueous (NaCl) solutions to organic solvents in the presence of trialkylphosphine oxide were determined at 293 K with the distribution ratios increasing as the concentration of NaCl increased.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Recovery of carboxylic acids C₁C₃ with organophosphine oxide solvating extractants

Wiśniewski

Pierzchalska

2005

J of Chemical Tech & Biotech

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“…This kind of "salting out" effect has been reported for other systems. 1,13 However, the "salting out" effect is not significant for the case 0.1 M NaCl, which in general is the upper limit of ionic strength used in emulsion polymerization for colloidal stability purposes. Thus it can be concluded that in emulsion polymerization systems the presence of the usual ionic salts will not have a significant effect on the distribution of hydroxy acrylate monomers.…”

Section: Resultsmentioning

confidence: 99%

Partitioning of Functional Monomers in Emulsion Polymerization: Distribution of Hydroxy (Meth)acrylate Monomers between Water and Single and Multimonomer Systems

Tripathi

Sundberg

2013

Ind. Eng. Chem. Res.

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We have studied the partitioning behavior of a series of hydroxy acrylate monomers (2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and 2-hydroxypropyl methacrylate) between water and a variety of styrene, acrylate, and methacrylate homo-, co-, and termonomer phases. The distribution coefficients for both single and multicomponent systems strongly depend upon the hydrogen bond acceptor characteristics of the organic phase, but not on the pH of the aqueous phase. These measured distribution coefficients for multicomponent monomer systems can be adequately predicted by applying an appropriate "mixing rule" to the distribution and dimerization coefficients obtained from single monomer systems. The logarithms of these binary coefficients correlate linearly with the molar volume of the (meth)acrylate monomer phase. Hydroxy acrylate monomers are subject to dimerization and multimer formation in organic phases and those equilibrium coefficients are roughly equal for the three monomers studied here, despite their wide difference in polarities. When vinyl acid and hydroxy acrylate monomers are used simultaneously, the distribution coefficients for both monomers increase. These effects depend upon the polarity of the organic phase, the polarities of both functional monomers, and the amount of the functional monomers used in the system. We found minor effects of temperature and negligible effects of ionic strength for the usual emulsion polymerization conditions.

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“…The partition experiments were conducted under conditions where the pH of the aqueous phase remained well below the pK a of the acid by the addition of HCl. The effects generated, therefore, from carbon dioxide on the ionization of acetic acid are minimized [15] and acetic acid exists predominately in the undissociated form in the aqueous phase. Eq.…”

Section: Resultsmentioning

confidence: 99%

Solvation model for acetic acid in binary mixtures of cyclohexane–1,2-dichloroethane

Abu-Shady¹,

Al–Mudhaf²,

Hegazi³

2004

Fluid Phase Equilibria

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Partition data of propionic and butyric acids between aqueous NaCl solutions and cyclohexane

Cited by 7 publications

References 6 publications

Recovery of carboxylic acids C₁C₃ with organophosphine oxide solvating extractants

Recovery of carboxylic acids C₁C₃ with organophosphine oxide solvating extractants

Partitioning of Functional Monomers in Emulsion Polymerization: Distribution of Hydroxy (Meth)acrylate Monomers between Water and Single and Multimonomer Systems

Solvation model for acetic acid in binary mixtures of cyclohexane–1,2-dichloroethane

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Partition data of propionic and butyric acids between aqueous NaCl solutions and cyclohexane

Cited by 7 publications

References 6 publications

Recovery of carboxylic acids C1C3 with organophosphine oxide solvating extractants

Recovery of carboxylic acids C1C3 with organophosphine oxide solvating extractants

Partitioning of Functional Monomers in Emulsion Polymerization: Distribution of Hydroxy (Meth)acrylate Monomers between Water and Single and Multimonomer Systems

Solvation model for acetic acid in binary mixtures of cyclohexane–1,2-dichloroethane

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Recovery of carboxylic acids C₁C₃ with organophosphine oxide solvating extractants

Recovery of carboxylic acids C₁C₃ with organophosphine oxide solvating extractants