Stoichiometric and Spectroscopic Study of Reactive Extraction of Phenylacetic Acid with Tri-n-Butyl Phosphate

Athankar, Kanti Kumar

doi:10.15255/cabeq.2014.2045

Cited by 12 publications

(5 citation statements)

References 39 publications

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“…A 30 wt % H 2 O 2 solution was added to each solution and diluted to approximately 100 mM as the precursor for the in situ generated OH radical after exposure to UVB light. Monochloroacetate (MCA – ), whose p K a = 2.86 and reaction rate against OH at a high pH is (1.8 ± 0.1) × 10 8 M –1 s –1 , was used as the reference compound for the triethylamine/triethylaminium + OH reaction rates determination. The concentrations of TEA(H + ) and MCA – were each 0.2 mM.…”

Section: Experimental Design and Instrumentsmentioning

confidence: 99%

Kinetics and Products of the Aqueous Phase Oxidation of Triethylamine by OH

Tao

Liu

Yang

et al. 2021

ACS Earth Space Chem.

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Low-molecular-weight alkyl amines have attracted attention for their roles in new particle formation, ultrafine particle growth, and neutralizing aerosol acidity. The major source of the low-molecular-weight aminium ions in fine particles is generally believed to be the corresponding gaseous precursors emitted to the atmosphere. Relatively little work has investigated whether larger amines can be transformed into smaller amines within the condensed phase itself. In this work, we studied the bulk aqueous phase oxidation kinetics and products of triethylamine/triethylaminium (pK a = 10.75) against OH under different values of pH. Using relative rate kinetics, we find that the oxidation rates against OH for TEA and TEAH+ are (74.3 ± 6.5) × 108 and (1.8 ± 0.2) × 108 M–1 s–1, respectively. In a dilute NaHSO4 solution with a pH of 3.2, the ionic products of TEAH+ oxidation include diethylaminium, ethylaminium, and ammonium ions, which are formed within an atmospherically relevant oxidation time scale. Under common atmospheric conditions, aqueous phase oxidation is calculated to be competitive with gas phase oxidation as a sink for TEA. This indicates that some low-molecular-weight aminium ions can also be the products of the aqueous phase oxidation of larger N-containing molecules.

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Section: Experimental Design and Instrumentsmentioning

confidence: 99%

Kinetics and Products of the Aqueous Phase Oxidation of Triethylamine by OH

Tao

Liu

Yang

et al. 2021

ACS Earth Space Chem.

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“…In the present study, an attempt was made to develop a proficient reactive extraction system for the separation and recovery of benzeneacetic acid from dilute aqueous solution as one of the steps toward design the ISPR module. In our previous work, tri- n -butyl phosphate was used as an extractant. − Thus, this study contains a variety of experiments consisting of different combinations of tri- n -caprylyl amine (tri- n -octyl amine) with various diluents comprising aromatic hydrocarbons and alcohol (benzene, toluene, xylene, and hexanol) to investigate the reactive extraction study of benzeneacetic acid from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Reactive Separation of Benzeneacetic Acid with Tri-n-caprylyl Amine: Equilibrium and Modeling

et al. 2016

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Benzeneacetic acid is an important carboxylic acid extensively used in pharmaceutical industries. Thus, interest has been growing in the scientific community toward its recovery from aqueous streams or fermentation broth. Extraction of carboxylic acids by reactive extraction using extractant-diluent is the emerging area of study. With this concept, the reactive extraction of benzeneacetic acid was carried out to study (i) effect of diluents, such as benzene, toluene, xylene, and hexanol; (ii) effect of concentration of extractant, tri-n-caprylyl amine; (iii) effect of pH; and (iv) equilibrium modeling, namely, relative basicity model and mass action law. The equilibrium results are discussed in terms of partition coefficient (P), dimerization constant (D), distribution coefficient (K D ), extraction efficiency (η%), overall equilibrium complexation constant (K e ), and loading factor (ϕ). Distribution coefficient trend was observed as xylene > benzene > toluene > hexanol. The extraction efficiency of benzeneacetic acid was found to be 99.2% when 0.46 mol·kg −1 tri-n-caprylyl amine was employed in xylene. Moreover, equilibrium results were fitted with relative basicity and mass action law model and it was found that relative basicity model predicted the results better than mass action law for reactive extraction of benzeneacetic acid. The study will be useful in the design of reactive extraction process for the recovery of benzeneacetic acid.

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“…The liquid–liquid extractions accompanied by a chemical reaction generally fall into four different regimes of very slow, slow, fast, and instantaneous reactions based on the reaction rates. − According to the criteria given in the referred literature, if the rate of a certain reaction is independent of the intensity of mixing and depends on the change in the volume of the organic phase when the rates are directly proportional to the concentration of both the reactants, those can be identified as reactions pertaining to the “very slow regime.” The experimental validation of the reaction regime can be carried out by analyzing the dependence of the reaction rate on the agitation speed and volume of the organic phase taking part in the reaction. Figures and represent such an analysis of the relation of the reaction rates with the shaking speed (intensity of mixing) and volume of the organic phase, respectively, during the complexation reaction.…”

Section: Results and Discussionmentioning

confidence: 99%

Experimental Study on Influencing Factors of Microfluidic Reactive Extraction of Citric Acid Using TOA in 1-Decanol and Flow Schemes for Performance Improvement

Abraham

Prabhu

Soundarajan

et al. 2020

Ind. Eng. Chem. Res.

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Microfluidic devices are highly efficient in providing higher mass transfer rates due to the enormous interfacial area created by the high surface-to-volume ratio. Droplet flow microfluidic devices can serve as an efficient process platform for the reactive extraction of various carboxylic acids from dilute aqueous solutions, but many of the process characteristics of these kinds of processes are not well studied, especially in very long microchannels. In this work, an effort has been made to analyze the mass transfer behavior of very long microchannels during reactive extraction of citric acid from aqueous solutions of different concentrations in a uniform circular, 0.9 mm diameter droplet flow microfluidic contactor using tri-n-octylamine (TOA) in 1-decanol. The above complexation process was confirmed to be a kinetically controlled slow reaction. The devised microfluidic systems delivered higher efficiency than conventional contactors used for liquid–liquid extraction. It was also found that the residence time, TOA concentration, and interfacial area are the important factors that influence the extraction performance. Novel flow schemes developed and presented in this work were successful in manipulating the above influencing factors, which were useful to increase the extraction performance or to reduce the length of the microchannel. The newly developed flow schemes for the flow modification were found to be very efficient in increasing the extraction performance in long microsystems.

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Stoichiometric and Spectroscopic Study of Reactive Extraction of Phenylacetic Acid with Tri-n-Butyl Phosphate

Cited by 12 publications

References 39 publications

Kinetics and Products of the Aqueous Phase Oxidation of Triethylamine by OH

Kinetics and Products of the Aqueous Phase Oxidation of Triethylamine by OH

Reactive Separation of Benzeneacetic Acid with Tri-n-caprylyl Amine: Equilibrium and Modeling

Experimental Study on Influencing Factors of Microfluidic Reactive Extraction of Citric Acid Using TOA in 1-Decanol and Flow Schemes for Performance Improvement

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