Partition data of acetic acid between aqueous NaCl solutions and trioctylphosphine oxide in cyclohexane diluent

Al–Mudhaf, Humood F.; Hegazi, Mohamed F.; Abu-Shady, Abdel-Sattar I.

doi:10.1016/s1383-5866(01)00192-7

Cited by 18 publications

(12 citation statements)

References 10 publications

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“…Senol (1999) has deduced a molar loading of greater than one for carboxylic acids removal from water by alamine 336 in halogenated hydrocarbon diluents. The use of trioctylphosphine oxide (TOPO) as an extractant for the removal of fatty acids from aqueous solutions is discussed in several papers (Helsel 1977;Niitsu and Sekine 1978;Wardell and King 1978;Ricker et al 1979;Hano et al 1990;Reisinger and King 1995;Juang and Wu 1999;Al-Mudhaf et al 2002;Wisniewski and Pierzchalska 2005). Because of its high hydrogen bonding acceptor basicity, TOPO complexes strongly with a carboxylic acid in an organic phase, thereby enhancing the transfer of carboxylic acid into the extract phase.…”

Section: Chemicalsmentioning

confidence: 99%

Conditioning hardwood-derived pre-pulping extracts for use in fermentation through removal and recovery of acetic acid using trioctylphosphine oxide (TOPO)

Friedman

Walsum

2011

Holzforschung

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Extraction characteristics are shown for trioctylphosphine oxide (TOPO) dissolved in alkane for recovery of acetic acid from dilute water solution and hardwood-derived hemicellulose extracts. The recovery of acetic acid with TOPO is significantly influenced by the pH in the aqueous phase and lightly affected by temperature. In a one-stage extraction, 76.0% of the acetic acid could be extracted below pH 3. The yield of fractional extractions increase with increasing TOPO concentration in alkane and with increasing acetic acid concentration in the aqueous phase. It was found that for dilute extractions carried out at 708C and pH 1, the solvent extraction is effective at 37% TOPO in alkane (w/w) and that little improvement is realized by further increases in TOPO concentration. Partition coefficients for green liquor and hot water extracts ranged between 2.0 and 2.5 at the tested conditions. Fermentation of hemicellulose extracts that had been treated with TOPO for removal of acetic acid was tested to determine whether TOPO processing resulted in any positive or adverse affects on the microbial activity. Fermentation of TOPO-treated green liquor hemicellulose extract with Pichia stipitis resulted in improved ethanol production relative to untreated extract. Accordingly, placement of TOPO extraction after hydrolysis and prior to fermentation is optimal for acetic acid recovery and maintenance of fermentation rates.

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Section: Chemicalsmentioning

confidence: 99%

Conditioning hardwood-derived pre-pulping extracts for use in fermentation through removal and recovery of acetic acid using trioctylphosphine oxide (TOPO)

Friedman

Walsum

2011

Holzforschung

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“…Senol [16] deduced a molar loading of greater than one for carboxylic acids removal from water by alamine 336 in halogenated hydrocarbon diluents. The use of tri-n-ctylphosphine oxide (TOPO) as an extractant for the removal of fatty acids from aqueous solutions has been discussed in several papers [15,[18][19][20][21][22][23][24][25]. Because of its high hydrogen-bonding acceptor basicity, TOPO complexes strongly with a carboxylic acid in an organic phase, enhancing the transfer of the carboxylic acid to the extract phase.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Evaluation of Organic Acid Recovery from Kraft Black Liquor Using Liquid-Liquid Extraction

Kwon¹,

Um²

2016

Korean Chemical Engineering Research

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− Liquid-liquid extraction (LLE) can be used for the recovery of acetic acid from black liquor prior to bioethanol fermentation. Recovery of value-added chemicals such as acetic-, formic-and lactic acid using LLE from Kraft black liquor was studied. Acetic acid and formic acid have been reported to be strong inhibitors in fermentation. The study elucidates the effect of three reaction parameters: pH (0.5~3.5), temperature (25~65 o C), and reaction time (24~48 min). Extraction performance using tri-n-octylphosphine oxide as the extractant was evaluated. The maximum acetic acid concentration achieved from hydrolyzates was 69.87% at 25°C, pH= 0.5, and 36 min. Factorial design was used to study the effects of pH, temperature, and reaction time on the maximum inhibitor extraction yield after LLE. The maximum potential extraction yield of acetic acid was 70.4% at 25.8°C, pH=0.6 and 37.2 min residence time.

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“…A molar loading of greater than one was deduced by Senol [19] the removal of carboxylic acids from water using alamine 336 in halogenated hydrocarbon diluents. The use of trioctylphosphine oxide (TOPO) as an extractant for the removal of fatty acids from aqueous solutions is discussed in several papers [18,[22][23][24][25][26][27][28][29]. Due to its high hydrogen bonding acceptor basicity, TOPO undergoes strong complexation with carboxylic acids in the organic phase, thereby enhancing the transfer of the carboxylic acid into the extract phase.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, TOPO is characterized by excellent stability, a high boiling point, and low solubility in water. Al-Mudhaf et al [28] reported the separation of acetic acid from aqueous NaCl solutions into cyclohexane containing various concentrations of TOPO (as an extractant) at 30 o C. They concluded that optimized TOPO use is required for economic organic acid recovery and that the sensitivity towards salts increases with increasing distribution ratio based on the evident effect that free TOPO is able to complex with a larger number of acetic acid molecules when acetic acid salted out from the aqueous phase. The current study utilizes a distillation process that facilitates recovery and reuse of the solvents being studied from the organic phase containing acetic acid.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Acetic Acid from An Ethanol Fermentation Broth by Liquid-Liquid Extraction (LLE) Using Various Solvents

Pham¹,

Kim²,

Um³

2015

Korean Chemical Engineering Research

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− Liquid-liquid extraction (LLE) using various solvents was studied for recovery of acetic acid from a synthetic ethanol fermentation broth. The microbial fermentation of sugars presented in hydrolyzate gives rise to acetic acid as a byproduct. In order to obtain pure ethanol for use as a biofuel, fermentation broth should be subjected to acetic acid removal step and the recovered acetic acid can be put to industrial use. Herein, batch LLE experiments were carried out at 25°C using a synthetic fermentation broth comprising 20.0 g l -1 acetic acid and 5.0 g l -1 ethanol. Ethyl acetate (EtOAc), tri-n-octylphosphine oxide (TOPO), tri-n-octylamine (TOA), and tri-n-alkylphosphine oxide (TAPO) were utilized as solvents, and the extraction potential of each solvent was evaluated by varying the organic phase-to-aqueous phase ratios as 0.2, 0.5, 1.0, 2.0, and 4.0. The highest acetic acid extraction yield was achieved with TAPO; however, the lowest ethanol-to-acetic acid extraction ratio was obtained using TOPO. In a single-stage batch extraction, 97.0 % and 92.4 % of acetic acid could be extracted using TAPO and TOPO when the ratio of organic-to-aqueous phases is 4:1 respectively. A higher solvent-to-feed ratio resulted in an increase in the ethanol-to-acetic acid ratio, which decreased both acetic acid purity and acetic acid extraction yield.

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Partition data of acetic acid between aqueous NaCl solutions and trioctylphosphine oxide in cyclohexane diluent

Cited by 18 publications

References 10 publications

Conditioning hardwood-derived pre-pulping extracts for use in fermentation through removal and recovery of acetic acid using trioctylphosphine oxide (TOPO)

Conditioning hardwood-derived pre-pulping extracts for use in fermentation through removal and recovery of acetic acid using trioctylphosphine oxide (TOPO)

Optimization and Evaluation of Organic Acid Recovery from Kraft Black Liquor Using Liquid-Liquid Extraction

Recovery of Acetic Acid from An Ethanol Fermentation Broth by Liquid-Liquid Extraction (LLE) Using Various Solvents

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